[PATCH] Improved source range in nonnull diagnostics

[Aaron Ballman]

The attach patch addresses a FIXME asking for improved source range
information when a nonnull parameter or return type is not a pointer
type. A few questions come to mind:

1) Is my addition to ObjCMethodDecl the correct way to get return type
source range information?
2) Does this patch require tests? If so, do we have any source range
tests I should model after?

Thanks!

~Aaron
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