[PATCH] Add -Wnon-modular-include options

[Ben Langmuir]

This patch adds the warning options:

-Wnon-modular-include -- warn on any #include of a header that's not listed in a module map
  [-Wnon-modular-include-in-module -- subgroup, only warn if the include is in a module]
    -Wnon-modular-include-in-framework-module -- subgroup, only warn if the include is in a framework module

There had been discussion of this making -fmodules-strict-decluse redundant, but I wasn’t sure if we came to an agreement about that, so I didn’t remove it.


Ben
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