[clang] __builtin_memset_inline with negative size causes compiler to be killed(SIGKILL)

Clang trunk on x86-64 fails to compile the following testcase:
Reproducer: https://godbolt.org/z/W893PsEj3

```c
void fun(void *dst, char value) {

__builtin_memset_inline(dst, value, -1);
}
```

The compiler is terminated with SIGKILL:

```
Program terminated with signal: SIGKILL
Compiler returned: 137
```

The issue only occurs when the size argument is negative. Non-negative constant sizes compile normally.

This reproduces on Clang trunk, and the issue can be traced back to Clang 15.0.0.
This testcase was generated by fuzzer.

Start with the Godbolt reproducer and trace Clang's handling of __builtin_memset_inline when its constant size is negative. Compare this path with non-negative sizes and add a regression test showing that the negative-size case no longer terminates the compiler with SIGKILL.

Written by the indexing model from the issue text.