[cfe-commits] [commit-on-approval] Semantic checking for main()

[John McCall]

This ended up taking a little longer than expected because of places 
that exceed the spec.

Most of my diagnostics end up pointing to the 'main' symbol itself, 
rather than to types, because we don't seem to propagate source 
locations for types very reliably.  I also wanted to implement more 
fixits, but again, no source range information (and that's hard for C 
types anyway).

John.
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