[PATCH] Add an option -fmodules-validate-system-headers

[Ben Langmuir]

This patch adds an option -fmodules-validate-system-headers, which forces clang to check system input files when loading a module.  In general, this will mean that if the system headers a module depends on are changed, the module will be rebuilt.  Note: we don’t (usually) validate these system headers when this option is not set for performance reasons.

Ben
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