[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 `llvm-clang-aarch64-darwin` running on `doug-worker-5` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/190/builds/15358

<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: /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/opt -passes=loop-vectorize -S < /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/Transforms/LoopVectorize/AArch64/optsize_minsize.ll | /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/Transforms/LoopVectorize/AArch64/optsize_minsize.ll --check-prefix=DEFAULT
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/opt -passes=loop-vectorize -S
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/Transforms/LoopVectorize/AArch64/optsize_minsize.ll --check-prefix=DEFAULT
/Users/buildbot/buildbot-root/aarch64-darwin/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
^
/Users/buildbot/buildbot-root/aarch64-darwin/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: /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/Transforms/LoopVectorize/AArch64/optsize_minsize.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-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128-Fn32" 
              4: target triple = "aarch64-unknown-linux-gnu" 
              5:  
              6:  at A = global [1000 x i16] zeroinitializer, align 2 
              7:  at B = global [1000 x i32] zeroinitializer, align 4 
              8:  at C = global [1000 x i32] zeroinitializer, align 4 
              9:  
             10: define void @always_vectorize(ptr %p, i32 %x) { 
...

```

</details>

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