[clang-tools-extra] FIX : bugprone-too-small-loop-variable - false-negative when const variable is used as loop bound (PR #81183)

[Shourya Goel via cfe-commits]

Sh0g0-1758 wrote:

The changes in LibASTMatcher that you suggested resulted in test failures so I did not incorporate them. As far as doc change is considered, please elaborate on it. 

https://github.com/llvm/llvm-project/pull/81183