[llvm] [msan][NFCI] Remove element-size override for VNNI intrinsics (PR #172762)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `openmp-offload-amdgpu-runtime-2` running on `rocm-worker-hw-02` while building `llvm` at step 7 "Add check check-clang".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/10/builds/19425

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

```
Step 7 (Add check check-clang) failure: test (failure)
******************** TEST 'Clang :: Preprocessor/c99-6_10_3_4_p6.c' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 3
/home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/bin/clang -cc1 -internal-isystem /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/lib/clang/22/include -nostdsysteminc -E /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/clang/test/Preprocessor/c99-6_10_3_4_p6.c | /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/bin/FileCheck -strict-whitespace /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/clang/test/Preprocessor/c99-6_10_3_4_p6.c
# executed command: /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/bin/clang -cc1 -internal-isystem /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/lib/clang/22/include -nostdsysteminc -E /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/clang/test/Preprocessor/c99-6_10_3_4_p6.c
# .---command stderr------------
# | /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/clang/test/Preprocessor/c99-6_10_3_4_p6.c:7:57: warning: backslash and newline separated by space [-Wbackslash-newline-escape]
# |     7 | #define debug(s, t) printf("x" # s "= %d, x" # t "= s" \ 
# |       |                                                         ^
# | 1 warning generated.
# `-----------------------------
# executed command: /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/bin/FileCheck -strict-whitespace /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/clang/test/Preprocessor/c99-6_10_3_4_p6.c
# .---command stderr------------
# | /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/clang/test/Preprocessor/c99-6_10_3_4_p6.c:24:11: error: CHECK: expected string not found in input
# | // CHECK: include "vers2.h"
# |           ^
# | <stdin>:10:62: note: scanning from here
# | fputs("strncmp(\"abc\\0d\" \"abc\", '\\4') == 0" ": @\n", s);
# |                                                              ^
# | <stdin>:12:1: note: possible intended match here
# | include "vers2 .h"
# | ^
# | 
# | Input file: <stdin>
# | Check file: /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/clang/test/Preprocessor/c99-6_10_3_4_p6.c
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |             .
# |             .
# |             .
# |             5: # 1 "<command line>" 1 
# |             6: # 1 "<built-in>" 2 
# |             7: # 1 "/home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/clang/test/Preprocessor/c99-6_10_3_4_p6.c" 2 
# |             8: # 14 "/home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/clang/test/Preprocessor/c99-6_10_3_4_p6.c" 
# |             9: printf("x" "1" "= %d, x" "2" "= s" x1, x2); 
# |            10: fputs("strncmp(\"abc\\0d\" \"abc\", '\\4') == 0" ": @\n", s); 
# | check:24'0                                                                  X error: no match found
# |            11:  
# | check:24'0     ~
# |            12: include "vers2 .h" 
# | check:24'0     ~~~~~~~~~~~~~~~~~~~
# | check:24'1     ?                   possible intended match
# |            13: "hello"; 
# | check:24'0     ~~~~~~~~~
...

```

</details>

https://github.com/llvm/llvm-project/pull/172762