[llvm] [SLP] Move some of X86 tests to common directory (PR #106401)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `arc-builder` running on `arc-worker` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/3/builds/3717

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM :: Transforms/SLPVectorizer/diamond_broadcast.ll' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 3: /buildbot/worker/arc-folder/build/bin/opt < /buildbot/worker/arc-folder/llvm-project/llvm/test/Transforms/SLPVectorizer/diamond_broadcast.ll -passes=slp-vectorizer -S -mtriple=x86_64-unknown-linux -slp-threshold=-1 | /buildbot/worker/arc-folder/build/bin/FileCheck /buildbot/worker/arc-folder/llvm-project/llvm/test/Transforms/SLPVectorizer/diamond_broadcast.ll
+ /buildbot/worker/arc-folder/build/bin/opt -passes=slp-vectorizer -S -mtriple=x86_64-unknown-linux -slp-threshold=-1
+ /buildbot/worker/arc-folder/build/bin/FileCheck /buildbot/worker/arc-folder/llvm-project/llvm/test/Transforms/SLPVectorizer/diamond_broadcast.ll
RUN: at line 4: /buildbot/worker/arc-folder/build/bin/opt < /buildbot/worker/arc-folder/llvm-project/llvm/test/Transforms/SLPVectorizer/diamond_broadcast.ll -passes=slp-vectorizer -S -mtriple=aarch64-unknown-linux-gnu -slp-threshold=-1 | /buildbot/worker/arc-folder/build/bin/FileCheck /buildbot/worker/arc-folder/llvm-project/llvm/test/Transforms/SLPVectorizer/diamond_broadcast.ll
+ /buildbot/worker/arc-folder/build/bin/FileCheck /buildbot/worker/arc-folder/llvm-project/llvm/test/Transforms/SLPVectorizer/diamond_broadcast.ll
+ /buildbot/worker/arc-folder/build/bin/opt -passes=slp-vectorizer -S -mtriple=aarch64-unknown-linux-gnu -slp-threshold=-1
/buildbot/worker/arc-folder/build/bin/opt: warning: failed to infer data layout: unable to get target for 'aarch64-unknown-linux-gnu', see --version and --triple.
/buildbot/worker/arc-folder/build/bin/opt: WARNING: failed to create target machine for 'aarch64-unknown-linux-gnu': unable to get target for 'aarch64-unknown-linux-gnu', see --version and --triple.
/buildbot/worker/arc-folder/llvm-project/llvm/test/Transforms/SLPVectorizer/diamond_broadcast.ll:10:15: error: CHECK-NEXT: expected string not found in input
; CHECK-NEXT: [[TMP0:%.*]] = insertelement <4 x i32> poison, i32 [[LD]], i32 0
              ^
<stdin>:7:33: note: scanning from here
 %ld = load i32, ptr %A, align 4
                                ^
<stdin>:7:33: note: with "LD" equal to "%ld"
 %ld = load i32, ptr %A, align 4
                                ^
<stdin>:11:7: note: possible intended match here
 %arrayidx9 = getelementptr inbounds i32, ptr %B, i64 1
      ^

Input file: <stdin>
Check file: /buildbot/worker/arc-folder/llvm-project/llvm/test/Transforms/SLPVectorizer/diamond_broadcast.ll

-dump-input=help explains the following input dump.

Input was:
<<<<<<
           1: ; ModuleID = '<stdin>' 
           2: source_filename = "<stdin>" 
           3: target triple = "aarch64-unknown-linux-gnu" 
           4:  
           5: define i32 @diamond_broadcast(ptr noalias nocapture %B, ptr noalias nocapture %A) { 
           6: entry: 
           7:  %ld = load i32, ptr %A, align 4 
next:10'0                                     X error: no match found
next:10'1                                       with "LD" equal to "%ld"
           8:  %mul = mul i32 %ld, %ld 
next:10'0     ~~~~~~~~~~~~~~~~~~~~~~~~~
           9:  store i32 %mul, ptr %B, align 4 
next:10'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          10:  %mul8 = mul i32 %ld, %ld 
next:10'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~
          11:  %arrayidx9 = getelementptr inbounds i32, ptr %B, i64 1 
next:10'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
...

```

</details>

https://github.com/llvm/llvm-project/pull/106401