llvm-project

9d6062c4 - [clang][Dependency Scanning] Canonicalize Defines of a Compiler Invocation As Early As Possible (#159620)

[clang][Dependency Scanning] Canonicalize Defines of a Compiler Invocation As Early As Possible (#159620) Before this patch, we only perform `-D` canonicalization on the deep copy of the `CompilerInvocation` instance, since the canonicalization should have no impact on scanning. However, in the presence of CAS, the content of the `builtin` macros are included in the context hash. This patch makes sure that we canonicalize the scanning `CompilerInvocation`'s `-D`s. Part of work for rdar://136303612. --------- Co-authored-by: Jan Svoboda <jan@svoboda.ai>