[llvm] [AMDGPU][True16] added Pre-RA hint to improve copy elimination (PR #103366)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `ml-opt-devrel-x86-64` running on `ml-opt-devrel-x86-64-b2` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/175/builds/14810

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM :: CodeGen/AMDGPU/i1-to-bf16.ll' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 2: /b/ml-opt-devrel-x86-64-b1/build/bin/llc < /b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/i1-to-bf16.ll -mtriple=amdgcn -mcpu=hawaii | /b/ml-opt-devrel-x86-64-b1/build/bin/FileCheck /b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/i1-to-bf16.ll -check-prefix=GFX7
+ /b/ml-opt-devrel-x86-64-b1/build/bin/FileCheck /b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/i1-to-bf16.ll -check-prefix=GFX7
+ /b/ml-opt-devrel-x86-64-b1/build/bin/llc -mtriple=amdgcn -mcpu=hawaii
RUN: at line 3: /b/ml-opt-devrel-x86-64-b1/build/bin/llc < /b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/i1-to-bf16.ll -mtriple=amdgcn -mcpu=gfx942 | /b/ml-opt-devrel-x86-64-b1/build/bin/FileCheck /b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/i1-to-bf16.ll -check-prefix=GFX9
+ /b/ml-opt-devrel-x86-64-b1/build/bin/FileCheck /b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/i1-to-bf16.ll -check-prefix=GFX9
+ /b/ml-opt-devrel-x86-64-b1/build/bin/llc -mtriple=amdgcn -mcpu=gfx942
RUN: at line 4: /b/ml-opt-devrel-x86-64-b1/build/bin/llc < /b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/i1-to-bf16.ll -mtriple=amdgcn -mcpu=gfx1100 | /b/ml-opt-devrel-x86-64-b1/build/bin/FileCheck /b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/i1-to-bf16.ll -check-prefix=GFX11
+ /b/ml-opt-devrel-x86-64-b1/build/bin/FileCheck /b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/i1-to-bf16.ll -check-prefix=GFX11
+ /b/ml-opt-devrel-x86-64-b1/build/bin/llc -mtriple=amdgcn -mcpu=gfx1100
/b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/i1-to-bf16.ll:111:15: error: GFX11-NEXT: is not on the line after the previous match
; GFX11-NEXT: s_bfe_u32 s1, s0, 0x10010
              ^
<stdin>:79:2: note: 'next' match was here
 s_bfe_u32 s1, s0, 0x10010
 ^
<stdin>:77:32: note: previous match ended here
 v_cmp_u_f32_e32 vcc_lo, v0, v0
                               ^
<stdin>:78:1: note: non-matching line after previous match is here
 s_delay_alu instid0(VALU_DEP_2) | instskip(NEXT) | instid1(SALU_CYCLE_1)
^
/b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/i1-to-bf16.ll:308:15: error: GFX11-NEXT: expected string not found in input
; GFX11-NEXT: s_delay_alu instid0(VALU_DEP_3) | instskip(SKIP_2) | instid1(SALU_CYCLE_1)
              ^
<stdin>:212:28: note: scanning from here
 v_cmp_u_f32_e64 s1, v0, v0
                           ^
<stdin>:213:2: note: possible intended match here
 s_delay_alu instid0(VALU_DEP_3) | instskip(SKIP_1) | instid1(VALU_DEP_2)
 ^
/b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/i1-to-bf16.ll:1164:15: error: GFX11-NEXT: is not on the line after the previous match
; GFX11-NEXT: s_bfe_u32 s1, s0, 0x10010
              ^
<stdin>:705:2: note: 'next' match was here
 s_bfe_u32 s1, s0, 0x10010
 ^
<stdin>:703:32: note: previous match ended here
 v_cmp_u_f32_e32 vcc_lo, v0, v0
                               ^
<stdin>:704:1: note: non-matching line after previous match is here
 s_delay_alu instid0(VALU_DEP_2) | instskip(NEXT) | instid1(SALU_CYCLE_1)
^
/b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/i1-to-bf16.ll:1361:15: error: GFX11-NEXT: expected string not found in input
; GFX11-NEXT: s_delay_alu instid0(VALU_DEP_3) | instskip(SKIP_2) | instid1(SALU_CYCLE_1)
              ^
...

```

</details>

https://github.com/llvm/llvm-project/pull/103366