[clang][deps] Fix race condition #6231
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D140176 introduced new `FullDeps` API that's not thread-safe, breaking the class invariant. This was causing race condition when `clang-scan-deps` was run with multiple threads. Reviewed By: steven_wu, akyrtzi Differential Revision: https://reviews.llvm.org/D143428 (cherry picked from commit 152f291)
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