[llvm] [AMDGPU] Fix eliminateFrameIndex assertion when reusing the frame register. (PR #215182)

[via llvm-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Linux-->
# :penguin: Linux x64 Test Results

* 180250 tests passed
* 3645 tests skipped
* 1 test failed

## Failed Tests
(click on a test name to see its output)

### LLVM
<details>
<summary>LLVM.CodeGen/AMDGPU/eliminate-frame-index-flat-scratch-frame-reg-no-sgpr.ll</summary>

```
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 1
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/llc -O3 -mtriple=amdgcn-amd-amdhsa -mcpu=gfx942 < /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/AMDGPU/eliminate-frame-index-flat-scratch-frame-reg-no-sgpr.ll | /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/FileCheck /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/AMDGPU/eliminate-frame-index-flat-scratch-frame-reg-no-sgpr.ll
# executed command: /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/llc -O3 -mtriple=amdgcn-amd-amdhsa -mcpu=gfx942
# note: command had no output on stdout or stderr
# executed command: /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/FileCheck /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/AMDGPU/eliminate-frame-index-flat-scratch-frame-reg-no-sgpr.ll
# .---command stderr------------
# | /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/AMDGPU/eliminate-frame-index-flat-scratch-frame-reg-no-sgpr.ll:20:10: error: CHECK: expected string not found in input
# | ; CHECK: there is a frame register!
# |          ^
# | <stdin>:1:1: note: scanning from here
# |  .amdgcn_target "amdgcn-amd-amdhsa-unknown-gfx942"
# | ^
# | <stdin>:4:86: note: possible intended match here
# |  .globl no_scavengeable_sgpr_with_frame_register ; -- Begin function no_scavengeable_sgpr_with_frame_register
# |                                                                                      ^
# | 
# | Input file: <stdin>
# | Check file: /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/AMDGPU/eliminate-frame-index-flat-scratch-frame-reg-no-sgpr.ll
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |             1:  .amdgcn_target "amdgcn-amd-amdhsa-unknown-gfx942" 
# | check:20'0    {                                                     search range start (exclusive)
# | check:20'1                                                          error: no match found in search range
# |             2:  .amdhsa_code_object_version 6 
# |             3:  .text 
# |             4:  .globl no_scavengeable_sgpr_with_frame_register ; -- Begin function no_scavengeable_sgpr_with_frame_register 
# | check:20'2                                                                                          ?                          possible intended match
# |             5:  .p2align 6 
# |             6:  .type no_scavengeable_sgpr_with_frame_register, at function 
# |             7: no_scavengeable_sgpr_with_frame_register: ; @no_scavengeable_sgpr_with_frame_register 
# | check:20'3                                              }                                              search range end (exclusive)
# |             8: ; %bb.0: ; %entry 
# |             9:  s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0) 
# |            10:  s_mov_b64 s[0:1], src_private_base 
# |            11:  v_mov_b64_e32 v[0:1], 0 
# |            12:  v_mov_b32_e32 v2, s1 
# |             .
# |             .
# |             .
# | >>>>>>
# `-----------------------------
# error: command failed with exit status: 1

--

```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

https://github.com/llvm/llvm-project/pull/215182