[llvm] [IVDescriptors] Identify min/max recurrences in single pass. (PR #163460)

[via llvm-commits]

github-actions[bot] wrote:

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

* 130461 tests passed
* 2911 tests skipped
* 1 test failed

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

### LLVM
<details>
<summary>LLVM.Transforms/LoopVectorize/AArch64/partial-reduce-dot-product-neon.ll</summary>

```
Exit Code: 2

Command Output (stdout):
--
# RUN: at line 2
c:\_work\llvm-project\llvm-project\build\bin\opt.exe -passes=loop-vectorize -enable-epilogue-vectorization=false -mattr=+neon,+dotprod -force-vector-interleave=1 -S < C:\_work\llvm-project\llvm-project\llvm\test\Transforms\LoopVectorize\AArch64\partial-reduce-dot-product-neon.ll | c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe C:\_work\llvm-project\llvm-project\llvm\test\Transforms\LoopVectorize\AArch64\partial-reduce-dot-product-neon.ll --check-prefixes=CHECK-INTERLEAVE1
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\opt.exe' -passes=loop-vectorize -enable-epilogue-vectorization=false -mattr=+neon,+dotprod -force-vector-interleave=1 -S
# .---command stderr------------
# | c:\_work\llvm-project\llvm-project\build\bin\opt.exe: <stdin>:2516:42: error: use of undefined value '%for.body'
# |   br i1 %exitcond.not, label %end, label %for.body
# |                                          ^
# `-----------------------------
# error: command failed with exit status: 1
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe' 'C:\_work\llvm-project\llvm-project\llvm\test\Transforms\LoopVectorize\AArch64\partial-reduce-dot-product-neon.ll' --check-prefixes=CHECK-INTERLEAVE1
# .---command stderr------------
# | FileCheck error: '<stdin>' is empty.
# | FileCheck command line:  c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe C:\_work\llvm-project\llvm-project\llvm\test\Transforms\LoopVectorize\AArch64\partial-reduce-dot-product-neon.ll --check-prefixes=CHECK-INTERLEAVE1
# `-----------------------------
# 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/163460