Add more // unit-tests to MIR opt tests

Author: JakobDegen

src/test/mir-opt/bool_compare.rs

@@ -1,3 +1,5 @@
+// unit-test: InstCombine
+
 // EMIT_MIR bool_compare.opt1.InstCombine.diff
 fn opt1(x: bool) -> u32 {
     if x != true { 0 } else { 1 }

src/test/mir-opt/combine_array_len.norm2.InstCombine.64bit.diff

@@ -1,4 +1,4 @@
-// EMIT_MIR_FOR_EACH_BIT_WIDTH
+// unit-test: InstCombine
 // EMIT_MIR combine_array_len.norm2.InstCombine.diff
 
 fn norm2(x: [f32; 2]) -> f32 {

src/test/mir-opt/combine_array_len.norm2.InstCombine.32bit.diff renamed to src/test/mir-opt/combine_array_len.norm2.InstCombine.diff

@@ -1,3 +1,5 @@
+// unit-test: ConstGoto
+
 pub enum Foo {
     A,
     B,

src/test/mir-opt/combine_array_len.rs

@@ -17,7 +17,7 @@
       bb0: {
           StorageLive(_1);                 // scope 0 at $DIR/const_goto_storage.rs:+1:9: +1:12
 -         StorageLive(_2);                 // scope 0 at $DIR/const_goto_storage.rs:+1:21: +1:23
--         nop;                             // scope 0 at $DIR/const_goto_storage.rs:+1:21: +1:23
+-         Deinit(_2);                      // scope 0 at $DIR/const_goto_storage.rs:+1:21: +1:23
 -         StorageLive(_3);                 // scope 0 at $DIR/const_goto_storage.rs:+2:15: +6:10
 -         StorageLive(_4);                 // scope 0 at $DIR/const_goto_storage.rs:+2:18: +2:76
 -         StorageLive(_5);                 // scope 0 at $DIR/const_goto_storage.rs:+2:21: +2:52

src/test/mir-opt/const_goto.rs

@@ -1,3 +1,5 @@
+// unit-test: ConstGoto
+
 // EMIT_MIR const_goto_storage.match_nested_if.ConstGoto.diff
 fn match_nested_if() -> bool {
     let val = match () {

src/test/mir-opt/const_goto_storage.match_nested_if.ConstGoto.diff

@@ -1,3 +1,5 @@
+// unit-test: Deaggregator
+
 struct Baz {
     x: usize,
     y: f32,

src/test/mir-opt/const_goto_storage.rs

@@ -1,3 +1,5 @@
+// unit-test: Deaggregator
+
 enum Baz {
     Empty,
     Foo { x: usize },

src/test/mir-opt/deaggregator_test.rs

@@ -1,3 +1,4 @@
+// unit-test: Deaggregator
 // Test that deaggregate fires in more than one basic block
 
 enum Foo {