[clang] Avoid -Wshadow warning when init-capture named same as class field (llvm#74512)

Shadowing warning doesn't make much sense since field is not available
in lambda's body without capturing this.

Fixes llvm#71976

Author: Fznamznon

clang/docs/ReleaseNotes.rst

@@ -939,6 +939,9 @@ Bug Fixes in This Version
 - Clang now doesn't produce false-positive warning `-Wconstant-logical-operand`
   for logical operators in C23.
   Fixes (`#64356 <https://github.com/llvm/llvm-project/issues/64356>`_).
+- Clang's ``-Wshadow`` no longer warns when an init-capture is named the same as
+  a class field unless the lambda can capture this.
+  Fixes (`#71976 <https://github.com/llvm/llvm-project/issues/71976>`_)
 
 Bug Fixes to Compiler Builtins
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^