[llvm] [LoopVectorize] Use CodeSize as the cost kind for minsize (PR #124119)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `ml-opt-devrel-x86-64` running on `ml-opt-devrel-x86-64-b2` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/175/builds/13911

<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/LoopVectorize/AArch64/optsize_minsize.ll' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 4: /b/ml-opt-devrel-x86-64-b1/build/bin/opt -passes=loop-vectorize -S < /b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/test/Transforms/LoopVectorize/AArch64/optsize_minsize.ll | /b/ml-opt-devrel-x86-64-b1/build/bin/FileCheck /b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/test/Transforms/LoopVectorize/AArch64/optsize_minsize.ll --check-prefix=DEFAULT
+ /b/ml-opt-devrel-x86-64-b1/build/bin/opt -passes=loop-vectorize -S
+ /b/ml-opt-devrel-x86-64-b1/build/bin/FileCheck /b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/test/Transforms/LoopVectorize/AArch64/optsize_minsize.ll --check-prefix=DEFAULT
/b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/test/Transforms/LoopVectorize/AArch64/optsize_minsize.ll:23:17: error: DEFAULT-NEXT: is not on the line after the previous match
; DEFAULT-NEXT: br label %[[VECTOR_BODY:.*]]
                ^
<stdin>:17:2: note: 'next' match was here
 br label %vector.body
 ^
<stdin>:14:11: note: previous match ended here
vector.ph: ; preds = %entry
          ^
<stdin>:15:1: note: non-matching line after previous match is here
 %broadcast.splatinsert = insertelement <4 x i32> poison, i32 %x, i64 0
^
/b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/test/Transforms/LoopVectorize/AArch64/optsize_minsize.ll:695:17: error: DEFAULT-NEXT: is not on the line after the previous match
; DEFAULT-NEXT: [[TMP10:%.*]] = call <vscale x 16 x i8> @llvm.stepvector.nxv16i8()
                ^
<stdin>:357:2: note: 'next' match was here
 %10 = call <vscale x 16 x i8> @llvm.stepvector.nxv16i8()
 ^
<stdin>:350:105: note: previous match ended here
 %active.lane.mask.entry = call <vscale x 16 x i1> @llvm.get.active.lane.mask.nxv16i1.i64(i64 0, i64 15)
                                                                                                        ^
<stdin>:351:1: note: non-matching line after previous match is here
 %broadcast.splatinsert = insertelement <vscale x 16 x i8> poison, i8 %a, i64 0
^

Input file: <stdin>
Check file: /b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/test/Transforms/LoopVectorize/AArch64/optsize_minsize.ll

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

Input was:
<<<<<<
          .
          .
          .
         12:  br i1 false, label %scalar.ph, label %vector.ph 
         13:  
         14: vector.ph: ; preds = %entry 
         15:  %broadcast.splatinsert = insertelement <4 x i32> poison, i32 %x, i64 0 
         16:  %broadcast.splat = shufflevector <4 x i32> %broadcast.splatinsert, <4 x i32> poison, <4 x i32> zeroinitializer 
         17:  br label %vector.body 
next:23       !~~~~~~~~~~~~~~~~~~~~  error: match on wrong line
...

```

</details>

https://github.com/llvm/llvm-project/pull/124119