[llvm] [llvm][ARM]Add widen global arrays pass (PR #107120)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-sie-ubuntu-fast` running on `sie-linux-worker` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/144/builds/9579

<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/GlobalOpt/ARM/arm-widen-strings-2.ll' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 2: /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/bin/opt < /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/llvm/test/Transforms/GlobalOpt/ARM/arm-widen-strings-2.ll -mtriple=arm-none-eabi -passes=globalopt -S | /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/bin/FileCheck /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/llvm/test/Transforms/GlobalOpt/ARM/arm-widen-strings-2.ll
+ /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/bin/FileCheck /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/llvm/test/Transforms/GlobalOpt/ARM/arm-widen-strings-2.ll
+ /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/bin/opt -mtriple=arm-none-eabi -passes=globalopt -S
/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/bin/opt: warning: failed to infer data layout: unable to get target for 'arm-unknown-none-eabi', see --version and --triple.
/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/bin/opt: WARNING: failed to create target machine for 'arm-unknown-none-eabi': unable to get target for 'arm-unknown-none-eabi', see --version and --triple.
/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/llvm/test/Transforms/GlobalOpt/ARM/arm-widen-strings-2.ll:9:15: error: CHECK-NEXT: expected string not found in input
; CHECK-NEXT: [[SOMETHING:%.*]] = alloca [64 x i8], align 1
              ^
<stdin>:8:7: note: scanning from here
entry:
      ^
<stdin>:9:7: note: possible intended match here
 %something = alloca [62 x i8], align 1
      ^

Input file: <stdin>
Check file: /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/llvm/test/Transforms/GlobalOpt/ARM/arm-widen-strings-2.ll

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

Input was:
<<<<<<
           1: ; ModuleID = '<stdin>' 
           2: source_filename = "<stdin>" 
           3: target triple = "arm-unknown-none-eabi" 
           4:  
           5:  at .str = private unnamed_addr constant [62 x i8] c"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\00", align 1 
           6:  
           7: define void @foo() local_unnamed_addr { 
label:7'0     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
label:7'1     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
           8: entry: 
next:8'0      ^~~~~~
next:8'1      ^~~~~~  captured var "ENTRY"
next:9'0            X error: no match found
           9:  %something = alloca [62 x i8], align 1 
next:9'0      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
next:9'1            ?                                  possible intended match
          10:  call void @llvm.memcpy.p0.p0.i32(ptr noundef nonnull align 1 dereferenceable(62) %something, ptr noundef nonnull align 1 dereferenceable(62) @.str, i32 62, i1 false) 
next:9'0      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          11:  %call2 = call i32 @bar(ptr nonnull %something) 
next:9'0      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          12:  ret void 
next:9'0      ~~~~~~~~~~
          13: } 
...

```

</details>

https://github.com/llvm/llvm-project/pull/107120