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[Modules] Add a command line option for loading the clang builtins modulemap.

Description

[Modules] Add a command line option for loading the clang builtins modulemap.

-fbuiltin-module-map loads the clang builtins modulemap file. (This is
equivalent to -fmodule-map-file=<resource dir>/include/module.modulemap)

Differential Revision: https://reviews.llvm.org/D25767