[llvm] [AMDGPU][True16][MC] validate op_sel and .l/.h syntax (PR #123250)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `ml-opt-dev-x86-64` running on `ml-opt-dev-x86-64-b1` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/137/builds/12592

<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 :: MC/AMDGPU/gfx11_asm_vopc_t16_promote.s' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 2: /b/ml-opt-dev-x86-64-b1/build/bin/llvm-mc -triple=amdgcn -mcpu=gfx1100 -mattr=+wavefrontsize64,+real-true16 -show-encoding /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/MC/AMDGPU/gfx11_asm_vopc_t16_promote.s 2>&1 | /b/ml-opt-dev-x86-64-b1/build/bin/FileCheck --check-prefix=GFX11 /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/MC/AMDGPU/gfx11_asm_vopc_t16_promote.s
+ /b/ml-opt-dev-x86-64-b1/build/bin/llvm-mc -triple=amdgcn -mcpu=gfx1100 -mattr=+wavefrontsize64,+real-true16 -show-encoding /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/MC/AMDGPU/gfx11_asm_vopc_t16_promote.s
+ /b/ml-opt-dev-x86-64-b1/build/bin/FileCheck --check-prefix=GFX11 /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/MC/AMDGPU/gfx11_asm_vopc_t16_promote.s
/b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/MC/AMDGPU/gfx11_asm_vopc_t16_promote.s:5:11: error: GFX11: expected string not found in input
// GFX11: v_cmp_class_f16_e64 vcc, v1.h, v255.h ; encoding: [0x6a,0x18,0x7d,0xd4,0x01,0xff,0x03,0x00]
          ^
<stdin>:1:1: note: scanning from here
llvm-mc: /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/include/llvm/ADT/SmallVector.h:295: const T& llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::operator[](llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::size_type) const [with T = llvm::MCOperand; <template-parameter-1-2> = void; llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::const_reference = const llvm::MCOperand&; llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::size_type = long unsigned int]: Assertion `idx < size()' failed.
^

Input file: <stdin>
Check file: /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/MC/AMDGPU/gfx11_asm_vopc_t16_promote.s

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

Input was:
<<<<<<
         1: llvm-mc: /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/include/llvm/ADT/SmallVector.h:295: const T& llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::operator[](llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::size_type) const [with T = llvm::MCOperand; <template-parameter-1-2> = void; llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::const_reference = const llvm::MCOperand&; llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::size_type = long unsigned int]: Assertion `idx < size()' failed. 
check:5     X~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ error: no match found
         2: PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace. 
check:5     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         3: Stack dump: 
check:5     ~~~~~~~~~~~~
         4: 0. Program arguments: /b/ml-opt-dev-x86-64-b1/build/bin/llvm-mc -triple=amdgcn -mcpu=gfx1100 -mattr=+wavefrontsize64,+real-true16 -show-encoding /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/MC/AMDGPU/gfx11_asm_vopc_t16_promote.s 
check:5     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         5:  #0 0x000055ffc7b7c428 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/b/ml-opt-dev-x86-64-b1/build/bin/llvm-mc+0xda2428) 
check:5     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         6:  #1 0x000055ffc7b79a44 SignalHandler(int) Signals.cpp:0:0 
check:5     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         .
         .
         .
>>>>>>

--

********************


```

</details>

https://github.com/llvm/llvm-project/pull/123250