[clang-tidy] Fix crash in readability-non-const-parameter with redecls (#200178) The check matches `VarDecls` with `hasInitializer()`, which uses `getAnyInitializer()` and may therefore match a redeclaration whose initializer is attached to another declaration. So calling `IgnoreParenCasts()` on `VD->getInit()` directly would crash when that redeclaration had no initializer of its own. This commit fixes the problem by using a new matcher that only matches VarDecls with an initializer on the current declaration. Closes https://github.com/llvm/llvm-project/issues/199197
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