[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 `premerge-monolithic-windows` running on `premerge-windows-1` while building `llvm` at step 8 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/35/builds/8113

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

```
Step 8 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM :: CodeGen/AMDGPU/i1-to-bf16.ll' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 2
c:\ws\buildbot\premerge-monolithic-windows\build\bin\llc.exe < C:\ws\buildbot\premerge-monolithic-windows\llvm-project\llvm\test\CodeGen\AMDGPU\i1-to-bf16.ll -mtriple=amdgcn -mcpu=hawaii | c:\ws\buildbot\premerge-monolithic-windows\build\bin\filecheck.exe C:\ws\buildbot\premerge-monolithic-windows\llvm-project\llvm\test\CodeGen\AMDGPU\i1-to-bf16.ll -check-prefix=GFX7
# executed command: 'c:\ws\buildbot\premerge-monolithic-windows\build\bin\llc.exe' -mtriple=amdgcn -mcpu=hawaii
# executed command: 'c:\ws\buildbot\premerge-monolithic-windows\build\bin\filecheck.exe' 'C:\ws\buildbot\premerge-monolithic-windows\llvm-project\llvm\test\CodeGen\AMDGPU\i1-to-bf16.ll' -check-prefix=GFX7
# RUN: at line 3
c:\ws\buildbot\premerge-monolithic-windows\build\bin\llc.exe < C:\ws\buildbot\premerge-monolithic-windows\llvm-project\llvm\test\CodeGen\AMDGPU\i1-to-bf16.ll -mtriple=amdgcn -mcpu=gfx942 | c:\ws\buildbot\premerge-monolithic-windows\build\bin\filecheck.exe C:\ws\buildbot\premerge-monolithic-windows\llvm-project\llvm\test\CodeGen\AMDGPU\i1-to-bf16.ll -check-prefix=GFX9
# executed command: 'c:\ws\buildbot\premerge-monolithic-windows\build\bin\llc.exe' -mtriple=amdgcn -mcpu=gfx942
# executed command: 'c:\ws\buildbot\premerge-monolithic-windows\build\bin\filecheck.exe' 'C:\ws\buildbot\premerge-monolithic-windows\llvm-project\llvm\test\CodeGen\AMDGPU\i1-to-bf16.ll' -check-prefix=GFX9
# RUN: at line 4
c:\ws\buildbot\premerge-monolithic-windows\build\bin\llc.exe < C:\ws\buildbot\premerge-monolithic-windows\llvm-project\llvm\test\CodeGen\AMDGPU\i1-to-bf16.ll -mtriple=amdgcn -mcpu=gfx1100 | c:\ws\buildbot\premerge-monolithic-windows\build\bin\filecheck.exe C:\ws\buildbot\premerge-monolithic-windows\llvm-project\llvm\test\CodeGen\AMDGPU\i1-to-bf16.ll -check-prefix=GFX11
# executed command: 'c:\ws\buildbot\premerge-monolithic-windows\build\bin\llc.exe' -mtriple=amdgcn -mcpu=gfx1100
# executed command: 'c:\ws\buildbot\premerge-monolithic-windows\build\bin\filecheck.exe' 'C:\ws\buildbot\premerge-monolithic-windows\llvm-project\llvm\test\CodeGen\AMDGPU\i1-to-bf16.ll' -check-prefix=GFX11
# .---command stderr------------
# | C:\ws\buildbot\premerge-monolithic-windows\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)
# | ^
# | C:\ws\buildbot\premerge-monolithic-windows\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)
# |  ^
# | C:\ws\buildbot\premerge-monolithic-windows\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)
...

```

</details>

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