Rollup merge of rust-lang#136761 - workingjubilee:specify-opt-level-for-codegen-tests, r=saethlin

tests: `-Copt-level=3` instead of `-O` in codegen tests

An effective blocker for redefining the meaning of `-O` is to stop reusing this somewhat ambiguous alias in our own codegen test suite. The choice between `-Copt-level=2` and `-Copt-level=3` is arbitrary for most of our tests. In most cases it makes no difference, so I set most of them to `-Copt-level=3`, as it will lead to slightly more "normalized" codegen.

Author: jhpratt

tests/codegen/abi-repr-ext.rs

@@ -1,4 +1,4 @@
-//@ compile-flags: -O
+//@ compile-flags: -Copt-level=3
 
 //@ revisions:x86_64 i686 aarch64-apple aarch64-windows aarch64-linux arm riscv
 

tests/codegen/align-offset.rs

@@ -1,4 +1,4 @@
-//@ compile-flags: -O
+//@ compile-flags: -Copt-level=3
 
 #![crate_type = "lib"]
 

tests/codegen/alloc-optimisation.rs

@@ -1,4 +1,4 @@
-//@ compile-flags: -O
+//@ compile-flags: -Copt-level=3
 #![crate_type = "lib"]
 
 #[no_mangle]

tests/codegen/array-clone.rs

@@ -1,4 +1,4 @@
-//@ compile-flags: -O
+//@ compile-flags: -Copt-level=3
 
 #![crate_type = "lib"]
 

tests/codegen/array-codegen.rs

@@ -1,4 +1,4 @@
-//@ compile-flags: -O -C no-prepopulate-passes
+//@ compile-flags: -Copt-level=3 -C no-prepopulate-passes
 
 #![crate_type = "lib"]
 

tests/codegen/array-equality.rs

@@ -1,4 +1,4 @@
-//@ compile-flags: -O -Z merge-functions=disabled
+//@ compile-flags: -Copt-level=3 -Z merge-functions=disabled
 //@ only-x86_64
 #![crate_type = "lib"]
 

tests/codegen/array-optimized.rs

@@ -1,4 +1,4 @@
-//@ compile-flags: -O
+//@ compile-flags: -Copt-level=3
 
 #![crate_type = "lib"]
 

tests/codegen/array-repeat.rs

@@ -1,4 +1,4 @@
-//@ compile-flags: -O
+//@ compile-flags: -Copt-level=3
 
 #![crate_type = "lib"]
 #![feature(array_repeat)]

tests/codegen/asm/goto.rs

@@ -1,4 +1,4 @@
-//@ compile-flags: -O
+//@ compile-flags: -Copt-level=3
 //@ only-x86_64
 
 #![crate_type = "rlib"]

tests/codegen/asm/may_unwind.rs

@@ -1,4 +1,4 @@
-//@ compile-flags: -O
+//@ compile-flags: -Copt-level=3
 //@ only-x86_64
 
 #![crate_type = "rlib"]