[5.9] Always specify -gmodules
on built-in Clang invocations
#64913
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Cherry-pick of #64912
This is currently always done when instantiating
ClangImporter
by manually setting the option on the Clang invocation with:Now also add it to
importer::addCommonInvocationArguments
so that the dependency scanner always generates command-lines with the required for Swift Clang flags.Resolves rdar://107570568