[clang-tools-extra] [clang-tidy] Add new check 'misc-scope-reduction' (PR #175429)

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+.. title:: clang-tidy - misc-scope-reduction
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+misc-scope-reduction
+====================
+
+Detects local variables in functions whose scopes can be minimized. This check
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vabridgers wrote:

I believe this is addressed, so resolving

https://github.com/llvm/llvm-project/pull/175429