Modules: Add -Rmodule-import

Add a remark for importing modules. Depending on whether this is a
direct import (into the TU being built by this compiler instance) or
transitive import (into an alrea

Modules: Add -Rmodule-import

Add a remark for importing modules. Depending on whether this is a
direct import (into the TU being built by this compiler instance) or
transitive import (into an already-imported module), the diagnostic has
two forms:

importing module 'Foo' from 'path/to/Foo.pcm'
importing module 'Foo' into 'Bar' from 'path/to/Foo.pcm'

Also drop a redundant FileCheck invocation in Rmodule-build.m that was
using -Reverything, since the notes from -Rmodule-import were confusing
it.

https://reviews.llvm.org/D58891

llvm-svn: 355477

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