[llvm] [VectorCombine] Fix duplicate freeze scheduling for shared indexes (PR #213461)

[via llvm-commits]

github-actions[bot] wrote:

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

* 179814 tests passed
* 3612 tests skipped
* 1 test failed

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

### LLVM
<details>
<summary>LLVM.Transforms/VectorCombine/X86/pr213423.ll</summary>

```
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 2
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/opt < /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/Transforms/VectorCombine/X86/pr213423.ll -passes=vector-combine -S | /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/FileCheck /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/Transforms/VectorCombine/X86/pr213423.ll
# executed command: /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/opt -passes=vector-combine -S
# 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/Transforms/VectorCombine/X86/pr213423.ll
# .---command stderr------------
# | /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/Transforms/VectorCombine/X86/pr213423.ll:13:15: error: CHECK-NEXT: expected string not found in input
# | ; CHECK-NEXT: [[V:%.*]] = load <2 x i16>, ptr null, align 4
# |               ^
# | <stdin>:7:7: note: scanning from here
# | entry:
# |       ^
# | <stdin>:7:7: note: pattern attempts to capture variables: "V"
# | entry:
# |       ^
# | <stdin>:11:2: note: possible intended match here
# |  %e1 = load i16, ptr %0, align 2
# |  ^
# | 
# | Input file: <stdin>
# | Check file: /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/Transforms/VectorCombine/X86/pr213423.ll
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |            1: ; ModuleID = '<stdin>' 
# |            2: source_filename = "<stdin>" 
# |            3: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128" 
# |            4: target triple = "x86_64-unknown-linux-gnu" 
# |            5:  
# |            6: define i1 @test_shared_index(i32 %base) { 
# |            7: entry: 
# | next:13'0          {   search range start (exclusive)
# | next:13'1              error: no match found in search range
# | next:13'2              pattern attempts to capture variables: "V"
# |            8:  %base.frozen = freeze i32 %base 
# |            9:  %idx = and i32 %base.frozen, 0 
# |           10:  %0 = getelementptr inbounds <2 x i16>, ptr null, i32 0, i32 %idx 
# |           11:  %e1 = load i16, ptr %0, align 2 
# | next:13'3      ?                                 possible intended match
# |           12:  %1 = getelementptr inbounds <2 x i16>, ptr null, i32 0, i32 %idx 
# |           13:  %e2 = load i16, ptr %1, align 2 
# |           14:  %cmp = icmp ule i16 %e1, %e2 
# |           15:  ret i1 %cmp 
# |           16: } 
# | next:13'4       } search range end (exclusive)
# | >>>>>>
# `-----------------------------
# 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/213461