[clang-tools-extra] [clang-tidy] fix cppcoreguidelines-narrowing-conversions false positives when narrowing integer to signed integer in C++20 (PR #116591)

[Congcong Cai via cfe-commits]

HerrCai0907 wrote:

It is difference level of issue. if it is an implement defined thing, it should 
be disabled unrelated to which coding guideline. But if it is well defined 
behavior, then coding guideline just a coding guideline. It even does not allow 
this kind of code.
```c++
short v(short a, short b) { return a + b; } // warning: narrowing conversion 
from 'int' to signed type 'short' is implementation-defined 
[cppcoreguidelines-narrowing-conversions]
```


https://github.com/llvm/llvm-project/pull/116591
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