swift

53a7ccaf - [cmake] Allow for add_swift_host_libraries to set that they shouldn't use llvm update flags.

[cmake] Allow for add_swift_host_libraries to set that they shouldn't use llvm update flags. This is specifically important for host libraries that include swift content. llvm_update_compile_flags currently doesn't conditionalize the flags it adds since it needs to be updated like I updated Swift's cmake in 558c9d408674a7a8e4743596e32f2c58d2e292b4. In the short amount of time that I am dealing with upstream to patch those flags, this patch will unblock eeckstein and let him continue with his libswift work.