fixup! [AArch64][llvm] Unify AArch64 tests into a single file (3/4) (NFC)

This is a series of patches (3/4) to unify assembly/disassembly of
recent AArch64 tests into a single file. The aim is to improve
consistency, so that all instructions and system registers are
thoroughly tested, and future test cases will be in a unified format.

This patch:
 * removes .txt tests which have multiple feature dependancies
 * makes the .s tests have a roundabout run line to test both encoding and assembly
 * creates diagnostic tests when needed

Co-authored-by: Virginia Cangelosi <virginia.cangelosi@arm.com>

Author: jthackray

llvm/test/MC/AArch64/armv8.6a-fgt.s

@@ -21,26 +21,31 @@ msr HFGRTR_EL2, x0
 // CHECK-ENCODING: encoding: [0x80,0x11,0x1c,0xd5]
 // CHECK-ERROR: :[[@LINE-3]]:5: error: expected writable system register or pstate
 // CHECK-UNKNOWN:  d51c1180      msr S3_4_C1_C1_4, x0
+
 msr HFGWTR_EL2, x5
 // CHECK-INST: msr HFGWTR_EL2, x5
 // CHECK-ENCODING: encoding: [0xa5,0x11,0x1c,0xd5]
 // CHECK-ERROR: :[[@LINE-3]]:5: error: expected writable system register or pstate
 // CHECK-UNKNOWN:  d51c11a5      msr S3_4_C1_C1_5, x5
+
 msr HFGITR_EL2, x10
 // CHECK-INST: msr HFGITR_EL2, x10
 // CHECK-ENCODING: encoding: [0xca,0x11,0x1c,0xd5]
 // CHECK-ERROR: :[[@LINE-3]]:5: error: expected writable system register or pstate
 // CHECK-UNKNOWN:  d51c11ca      msr S3_4_C1_C1_6, x10
+
 msr HDFGRTR_EL2, x15
 // CHECK-INST: msr HDFGRTR_EL2, x15
 // CHECK-ENCODING: encoding: [0x8f,0x31,0x1c,0xd5]
 // CHECK-ERROR: :[[@LINE-3]]:5: error: expected writable system register or pstate
 // CHECK-UNKNOWN:  d51c318f      msr S3_4_C3_C1_4, x15
+
 msr HDFGWTR_EL2, x20
 // CHECK-INST: msr HDFGWTR_EL2, x20
 // CHECK-ENCODING: encoding: [0xb4,0x31,0x1c,0xd5]
 // CHECK-ERROR: :[[@LINE-3]]:5: error: expected writable system register or pstate
 // CHECK-UNKNOWN:  d51c31b4      msr S3_4_C3_C1_5, x20
+
 msr HAFGRTR_EL2, x25
 // CHECK-INST: msr HAFGRTR_EL2, x25
 // CHECK-ENCODING: encoding: [0xd9,0x31,0x1c,0xd5]
@@ -52,80 +57,91 @@ mrs x30,  HFGRTR_EL2
 // CHECK-ENCODING: encoding: [0x9e,0x11,0x3c,0xd5]
 // CHECK-ERROR: :[[@LINE-3]]:11: error: expected readable system register
 // CHECK-UNKNOWN:  d53c119e      mrs x30, S3_4_C1_C1_4
+
 mrs x25,  HFGWTR_EL2
 // CHECK-INST: mrs x25, HFGWTR_EL2
 // CHECK-ENCODING: encoding: [0xb9,0x11,0x3c,0xd5]
 // CHECK-ERROR: :[[@LINE-3]]:11: error: expected readable system register
 // CHECK-UNKNOWN:  d53c11b9      mrs x25, S3_4_C1_C1_5
+
 mrs x20,  HFGITR_EL2
 // CHECK-INST: mrs x20, HFGITR_EL2
 // CHECK-ENCODING: encoding: [0xd4,0x11,0x3c,0xd5]
 // CHECK-ERROR: :[[@LINE-3]]:11: error: expected readable system register
 // CHECK-UNKNOWN:  d53c11d4      mrs x20, S3_4_C1_C1_6
+
 mrs x15,  HDFGRTR_EL2
 // CHECK-INST: mrs x15, HDFGRTR_EL2
 // CHECK-ENCODING: encoding: [0x8f,0x31,0x3c,0xd5]
 // CHECK-ERROR: :[[@LINE-3]]:11: error: expected readable system register
 // CHECK-UNKNOWN:  d53c318f      mrs x15, S3_4_C3_C1_4
+
 mrs x10,  HDFGWTR_EL2
 // CHECK-INST: mrs x10, HDFGWTR_EL2
 // CHECK-ENCODING: encoding: [0xaa,0x31,0x3c,0xd5]
 // CHECK-ERROR: :[[@LINE-3]]:11: error: expected readable system register
 // CHECK-UNKNOWN:  d53c31aa      mrs x10, S3_4_C3_C1_5
+
 mrs x5,   HAFGRTR_EL2
 // CHECK-INST: mrs x5, HAFGRTR_EL2
 // CHECK-ENCODING: encoding: [0xc5,0x31,0x3c,0xd5]
 // CHECK-ERROR: :[[@LINE-3]]:11: error: expected readable system register
 // CHECK-UNKNOWN:  d53c31c5      mrs x5, S3_4_C3_C1_6
 
-
 mrs x3, HDFGRTR2_EL2
 // CHECK-INST: mrs x3, HDFGRTR2_EL2
 // CHECK-ENCODING: encoding: [0x03,0x31,0x3c,0xd5]
 // CHECK-ERROR: :[[@LINE-3]]:9: error: expected readable system register
 // CHECK-UNKNOWN:  d53c3103      mrs x3, S3_4_C3_C1_0
+
 mrs x3, HDFGWTR2_EL2
 // CHECK-INST: mrs x3, HDFGWTR2_EL2
 // CHECK-ENCODING: encoding: [0x23,0x31,0x3c,0xd5]
 // CHECK-ERROR: :[[@LINE-3]]:9: error: expected readable system register
 // CHECK-UNKNOWN:  d53c3123      mrs x3, S3_4_C3_C1_1
+
 mrs x3, HFGRTR2_EL2
 // CHECK-INST: mrs x3, HFGRTR2_EL2
 // CHECK-ENCODING: encoding: [0x43,0x31,0x3c,0xd5]
 // CHECK-ERROR: :[[@LINE-3]]:9: error: expected readable system register
 // CHECK-UNKNOWN:  d53c3143      mrs x3, S3_4_C3_C1_2
+
 mrs x3, HFGWTR2_EL2
 // CHECK-INST: mrs x3, HFGWTR2_EL2
 // CHECK-ENCODING: encoding: [0x63,0x31,0x3c,0xd5]
 // CHECK-ERROR: :[[@LINE-3]]:9: error: expected readable system register
 // CHECK-UNKNOWN:  d53c3163      mrs x3, S3_4_C3_C1_3
+
 mrs x3, HFGITR2_EL2
 // CHECK-INST: mrs x3, HFGITR2_EL2
 // CHECK-ENCODING: encoding: [0xe3,0x31,0x3c,0xd5]
 // CHECK-ERROR: :[[@LINE-3]]:9: error: expected readable system register
 // CHECK-UNKNOWN:  d53c31e3      mrs x3, S3_4_C3_C1_7
 
-
 msr HDFGRTR2_EL2, x3
 // CHECK-INST: msr HDFGRTR2_EL2, x3
 // CHECK-ENCODING: encoding: [0x03,0x31,0x1c,0xd5]
 // CHECK-ERROR: :[[@LINE-3]]:5: error: expected writable system register or pstate
 // CHECK-UNKNOWN:  d51c3103      msr S3_4_C3_C1_0, x3
+
 msr HDFGWTR2_EL2, x3
 // CHECK-INST: msr HDFGWTR2_EL2, x3
 // CHECK-ENCODING: encoding: [0x23,0x31,0x1c,0xd5]
 // CHECK-ERROR: :[[@LINE-3]]:5: error: expected writable system register or pstate
 // CHECK-UNKNOWN:  d51c3123      msr S3_4_C3_C1_1, x3
+
 msr HFGRTR2_EL2, x3
 // CHECK-INST: msr HFGRTR2_EL2, x3
 // CHECK-ENCODING: encoding: [0x43,0x31,0x1c,0xd5]
 // CHECK-ERROR: :[[@LINE-3]]:5: error: expected writable system register or pstate
 // CHECK-UNKNOWN:  d51c3143      msr S3_4_C3_C1_2, x3
+
 msr HFGWTR2_EL2, x3
 // CHECK-INST: msr HFGWTR2_EL2, x3
 // CHECK-ENCODING: encoding: [0x63,0x31,0x1c,0xd5]
 // CHECK-ERROR: :[[@LINE-3]]:5: error: expected writable system register or pstate
 // CHECK-UNKNOWN:  d51c3163      msr S3_4_C3_C1_3, x3
+
 msr HFGITR2_EL2, x3
 // CHECK-INST: msr HFGITR2_EL2, x3
 // CHECK-ENCODING: encoding: [0xe3,0x31,0x1c,0xd5]