[llvm] [DA] Use ScalarEvolution::isKnownPredicate (PR #170919)

[via llvm-commits]

github-actions[bot] wrote:

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

* 166849 tests passed
* 2911 tests skipped
* 1 test failed

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

### LLVM
<details>
<summary>LLVM.Analysis/LoopCacheAnalysis/PowerPC/stencil.ll</summary>

```
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 1
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/opt < /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/Analysis/LoopCacheAnalysis/PowerPC/stencil.ll -passes='print<loop-cache-cost>' -disable-output 2>&1 | /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/FileCheck /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/Analysis/LoopCacheAnalysis/PowerPC/stencil.ll
# executed command: /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/opt '-passes=print<loop-cache-cost>' -disable-output
# 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/Analysis/LoopCacheAnalysis/PowerPC/stencil.ll
# .---command stderr------------
# | /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/Analysis/LoopCacheAnalysis/PowerPC/stencil.ll:14:10: error: CHECK: expected string not found in input
# | ; CHECK: Loop 'for.i' has cost = 30000
# |          ^
# | <stdin>:1:1: note: scanning from here
# | Loop 'for.i' has cost = 20400
# | ^
# | 
# | Input file: <stdin>
# | Check file: /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/Analysis/LoopCacheAnalysis/PowerPC/stencil.ll
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |           1: Loop 'for.i' has cost = 20400 
# | check:14     X~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ error: no match found
# |           2: Loop 'for.j' has cost = 900 
# | check:14     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | >>>>>>
# `-----------------------------
# 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/170919