[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-nvptx-nvidia-ubuntu` running on `as-builder-7` while building `llvm` at step 6 "test-build-unified-tree-check-llvm".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/180/builds/6880

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

```
Step 6 (test-build-unified-tree-check-llvm) failure: test (failure)
******************** TEST 'LLVM :: Transforms/GlobalOpt/ARM/arm-widen-strings-1.ll' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 2: /home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx-nvidia-ubuntu/build/bin/opt < /home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx-nvidia-ubuntu/llvm-project/llvm/test/Transforms/GlobalOpt/ARM/arm-widen-strings-1.ll -mtriple=arm-none-eabi -passes=globalopt -S | /home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx-nvidia-ubuntu/build/bin/FileCheck /home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx-nvidia-ubuntu/llvm-project/llvm/test/Transforms/GlobalOpt/ARM/arm-widen-strings-1.ll
+ /home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx-nvidia-ubuntu/build/bin/opt -mtriple=arm-none-eabi -passes=globalopt -S
+ /home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx-nvidia-ubuntu/build/bin/FileCheck /home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx-nvidia-ubuntu/llvm-project/llvm/test/Transforms/GlobalOpt/ARM/arm-widen-strings-1.ll
/home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx-nvidia-ubuntu/build/bin/opt: warning: failed to infer data layout: unable to get target for 'arm-unknown-none-eabi', see --version and --triple.
/home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx-nvidia-ubuntu/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/worker/as-builder-7/ramdisk/llvm-nvptx-nvidia-ubuntu/llvm-project/llvm/test/Transforms/GlobalOpt/ARM/arm-widen-strings-1.ll:9:15: error: CHECK-NEXT: expected string not found in input
; CHECK-NEXT: [[SOMETHING:%.*]] = alloca [12 x i8], align 1
              ^
<stdin>:8:7: note: scanning from here
entry:
      ^
<stdin>:9:7: note: possible intended match here
 %something = alloca [10 x i8], align 1
      ^

Input file: <stdin>
Check file: /home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx-nvidia-ubuntu/llvm-project/llvm/test/Transforms/GlobalOpt/ARM/arm-widen-strings-1.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: @.str = private unnamed_addr constant [10 x i8] c"123456789\00", align 1 
          6:  
          7: define void @foo() local_unnamed_addr { 
          8: entry: 
next:9'0           X error: no match found
          9:  %something = alloca [10 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(10) %something, ptr noundef nonnull align 1 dereferenceable(10) @.str, i32 10, i1 false) 
next:9'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         11:  %call2 = call i32 @bar(ptr nonnull %something) 
next:9'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         12:  ret void 
next:9'0     ~~~~~~~~~~
         13: } 
next:9'0     ~~
         14:  
next:9'0     ~
          .
...

```

</details>

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