[ClangImporter] Honor the 'DC' parameter for importStringLiteral. #10224
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We don't have any way to import a macro into a different DeclContext anyway, but even then this saves a bit of unnecessary work.
Groundwork for rdar://problem/32199805, which is that upstream Clang has removed a bunch of facilities for going from a SourceLocation or MacroInfo to a Module in favor of things like clang::ModuleMacro.