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[gn build] Add build files for clang/tools/{clang-diff,clang-import-test…

Description

[gn build] Add build files for clang/tools/{clang-diff,clang-import-test,diagtool and clang/lib/Tooling, clang/lib/Tooling/ASTDiff

Needed for check-clang.

Differential Revision: https://reviews.llvm.org/D56054