[clang] [llvm] [X86] Reduce -ffixed-r compile-time overhead (PR #184606)

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github-actions[bot] wrote:

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

* 131899 tests passed
* 2983 tests skipped
* 1 test failed

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

### LLVM
<details>
<summary>LLVM.Transforms/EarlyCSE/math-1.ll</summary>

```
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 2
c:\_work\llvm-project\llvm-project\build\bin\opt.exe -passes=early-cse -earlycse-debug-hash -S -o - C:\_work\llvm-project\llvm-project\llvm\test\Transforms\EarlyCSE\math-1.ll | c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe C:\_work\llvm-project\llvm-project\llvm\test\Transforms\EarlyCSE\math-1.ll
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\opt.exe' -passes=early-cse -earlycse-debug-hash -S -o - 'C:\_work\llvm-project\llvm-project\llvm\test\Transforms\EarlyCSE\math-1.ll'
# note: command had no output on stdout or stderr
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe' 'C:\_work\llvm-project\llvm-project\llvm\test\Transforms\EarlyCSE\math-1.ll'
# .---command stderr------------
# | C:\_work\llvm-project\llvm-project\llvm\test\Transforms\EarlyCSE\math-1.ll:189:15: error: CHECK-NEXT: expected string not found in input
# | ; CHECK-NEXT: [[RES:%.*]] = tail call fast float @tanhf(float 1.000000e+00)
# |               ^
# | <stdin>:148:23: note: scanning from here
# | define float @f_tanhf() {
# |                       ^
# | <stdin>:149:2: note: possible intended match here
# |  ret float 0x3FE85EFAC0000000
# |  ^
# | 
# | Input file: <stdin>
# | Check file: C:\_work\llvm-project\llvm-project\llvm\test\Transforms\EarlyCSE\math-1.ll
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |             .
# |             .
# |             .
# |           143: } 
# |           144:  
# |           145: ; Function Attrs: nofree nounwind willreturn 
# |           146: declare float @tanhf(float) #0 
# |           147:  
# |           148: define float @f_tanhf() { 
# | next:189'0                           X~~~ error: no match found
# |           149:  ret float 0x3FE85EFAC0000000 
# | next:189'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | next:189'1      ?                             possible intended match
# |           150: } 
# | next:189'0     ~~
# |           151:  
# | next:189'0     ~
# |           152: attributes #0 = { nofree nounwind willreturn } 
# | next:189'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |           153: attributes #1 = { nocallback nocreateundeforpoison nofree nosync nounwind speculatable willreturn memory(none) } 
# | next:189'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | >>>>>>
# `-----------------------------
# 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/184606