Artem Chikin 3ea5087e2f Add Swift compilation flags to enable Clang's validate-per-build-session module behavior ...

Add '-validate-clang-modules-once' and '-clang-build-session-file' corresponding to Clang's '-fmodules-validate-once-per-build-session' and '-fbuild-session-file='. Ensure they are propagated to module interface build sub-invocations.

We require these to be first-class Swift options in order to ensure they are propagated to both: ClangImporter and implicit interface build compiler sub-invocations.

Compiler portion of rdar://105982120

2023-02-28 13:19:05 -08:00

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