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

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+// RUN: %check_clang_tidy %s misc-scope-reduction %t -- --
+
+// Test case 1: Variable can be moved to smaller scope (if-block)
+void test_if_scope() {
+  int x = 42; // CHECK-MESSAGES: :[[@LINE]]:7: warning: variable 'x' can be declared in a smaller scope
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vabridgers wrote:

This should be addressed. Thanks for the comment.

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