[clang] [HLSL] error on out of bounds vector accesses (PR #128952)

[Hans Wennborg via cfe-commits]

zmodem wrote:

This broke our builds. Here's a small repro:

```
$ cat /tmp/a.cc
#include <immintrin.h>
__m256i parens;
int f() {
  return ((__v32qi)parens)[31];
}
$ build/bin/clang -c /tmp/a.cc
/tmp/a.cc:4:20: error: vector element index 31 is out of bounds
    4 |   return ((__v32qi)parens)[31];
      |                    ^
1 error generated.
```

`__v32qi` is a 32-element vector of char.

I'll revert to green for now.

https://github.com/llvm/llvm-project/pull/128952
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