[llvm-branch-commits] [llvm] ValueTracking: Revert noundef checks in computeKnownFPClass for fmul/fma (PR #178866)

[via llvm-branch-commits]

github-actions[bot] wrote:

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

* 129411 tests passed
* 2862 tests skipped
* 1 test failed

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

### LLVM
<details>
<summary>LLVM.Transforms/Attributor/nofpclass-fma.ll</summary>

```
Exit Code: 2

Command Output (stdout):
--
# RUN: at line 2
c:\_work\llvm-project\llvm-project\build\bin\opt.exe -aa-pipeline=basic-aa -passes=attributor -attributor-manifest-internal -S < C:\_work\llvm-project\llvm-project\llvm\test\Transforms\Attributor\nofpclass-fma.ll | c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe --allow-unused-prefixes C:\_work\llvm-project\llvm-project\llvm\test\Transforms\Attributor\nofpclass-fma.ll --check-prefixes=CHECK,TUNIT
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\opt.exe' -aa-pipeline=basic-aa -passes=attributor -attributor-manifest-internal -S
# .---command stderr------------
# | c:\_work\llvm-project\llvm-project\build\bin\opt.exe: <stdin>:84:21: error: use of undefined value '@returns_positive_or_nan'
# |   %pos2 = call half @returns_positive_or_nan()
# |                     ^
# `-----------------------------
# error: command failed with exit status: 1
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe' --allow-unused-prefixes 'C:\_work\llvm-project\llvm-project\llvm\test\Transforms\Attributor\nofpclass-fma.ll' --check-prefixes=CHECK,TUNIT
# .---command stderr------------
# | FileCheck error: '<stdin>' is empty.
# | FileCheck command line:  c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe --allow-unused-prefixes C:\_work\llvm-project\llvm-project\llvm\test\Transforms\Attributor\nofpclass-fma.ll --check-prefixes=CHECK,TUNIT
# `-----------------------------
# error: command failed with exit status: 2

--

```
</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/178866