[llvm] [AMDGPU] Add flag to control VGPR pressure limits (PR #203797)

[via llvm-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Windows-->
# :window: Windows x64 Test Results

* 135789 tests passed
* 3445 tests skipped
* 1 test failed

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

### LLVM
<details>
<summary>LLVM.CodeGen/AMDGPU/vgpr-excess-threshold-percent-invalid.ll</summary>

```
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 3
not c:\_work\llvm-project\llvm-project\build\bin\llc.exe -mtriple=amdgcn -mcpu=gfx942 -amdgpu-vgpr-excess-threshold-percent=-20 -o /dev/null C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\AMDGPU\vgpr-excess-threshold-percent-invalid.ll 2>&1 | c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe -check-prefix=NEGATIVE C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\AMDGPU\vgpr-excess-threshold-percent-invalid.ll
# executed command: not 'c:\_work\llvm-project\llvm-project\build\bin\llc.exe' -mtriple=amdgcn -mcpu=gfx942 -amdgpu-vgpr-excess-threshold-percent=-20 -o /dev/null 'C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\AMDGPU\vgpr-excess-threshold-percent-invalid.ll'
# note: command had no output on stdout or stderr
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe' -check-prefix=NEGATIVE 'C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\AMDGPU\vgpr-excess-threshold-percent-invalid.ll'
# .---command stderr------------
# | C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\AMDGPU\vgpr-excess-threshold-percent-invalid.ll:6:13: error: NEGATIVE: expected string not found in input
# | ; NEGATIVE: llc: for the --amdgpu-vgpr-excess-threshold-percent option: '-20' value invalid for uint argument!
# |             ^
# | <stdin>:1:1: note: scanning from here
# | llc.exe: for the --amdgpu-vgpr-excess-threshold-percent option: '-20' value invalid for uint argument!
# | ^
# | <stdin>:1:5: note: possible intended match here
# | llc.exe: for the --amdgpu-vgpr-excess-threshold-percent option: '-20' value invalid for uint argument!
# |     ^
# | 
# | Input file: <stdin>
# | Check file: C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\AMDGPU\vgpr-excess-threshold-percent-invalid.ll
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |            1: llc.exe: for the --amdgpu-vgpr-excess-threshold-percent option: '-20' value invalid for uint argument! 
# | check:6'0     X~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ error: no match found
# | check:6'1         ?                                                                                                   possible intended match
# | >>>>>>
# `-----------------------------
# 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/203797