[llvm] [X86][AsmParser] Support parentheses around scale and index register in Intel syntax (PR #211003)

[via llvm-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Windows-->
# :window: Windows x64 Test Results

* 139235 tests passed
* 3621 tests skipped
* 1 test failed

## Failed Tests
(click on a test name to see its output)

### LLVM
<details>
<summary>LLVM.tools/llvm-ml/struct.asm</summary>

```
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 1
llvm-ml64 -filetype=s C:\_work\llvm-project\llvm-project\llvm\test\tools\llvm-ml\struct.asm /Fo - | c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe C:\_work\llvm-project\llvm-project\llvm\test\tools\llvm-ml\struct.asm
# executed command: llvm-ml64 -filetype=s 'C:\_work\llvm-project\llvm-project\llvm\test\tools\llvm-ml\struct.asm' /Fo -
# .---command stderr------------
# | C:\_work\llvm-project\llvm-project\llvm\test\tools\llvm-ml\struct.asm:187:26: error: unmatched parenthesis
# | mov ax, (FOOBAR PTR [ebx]).f
# |                          ^
# `-----------------------------
# error: command failed with exit status: 1
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe' 'C:\_work\llvm-project\llvm-project\llvm\test\tools\llvm-ml\struct.asm'
# .---command stderr------------
# | C:\_work\llvm-project\llvm-project\llvm\test\tools\llvm-ml\struct.asm:191:15: error: CHECK-NEXT: expected string not found in input
# | ; CHECK-NEXT: mov ax, word ptr [ebx + 10]
# |               ^
# | <stdin>:117:5: note: scanning from here
# | t11:
# |     ^
# | <stdin>:118:2: note: possible intended match here
# |  mov ax, word ptr [rip + t1+10]
# |  ^
# | 
# | Input file: <stdin>
# | Check file: C:\_work\llvm-project\llvm-project\llvm\test\tools\llvm-ml\struct.asm
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |             .
# |             .
# |             .
# |           112: t10: 
# |           113:  mov eax, 10 
# |           114:  mov eax, 11 
# |           115:  
# |           116:  
# |           117: t11: 
# | next:191'0        {   search range start (exclusive)
# | next:191'1            error: no match found in search range
# |           118:  mov ax, word ptr [rip + t1+10] 
# | next:191'2      ?                                possible intended match
# |           119:  
# |           120:  
# | next:191'3      } search range end (exclusive)
# | >>>>>>
# `-----------------------------
# error: command failed with exit status: 1

--

```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

https://github.com/llvm/llvm-project/pull/211003