overridden methods to diagnose their type mismatch.
This is a general solution for previous fixes
for // rdar://6191214 and // rdar://9352731
and removes lots of duplicate code.
llvm-svn: 137222
declared in protocol in the class qualified by the
protocol have type conflicts. To reduce amount of
noise, this is done when class is implemented.
// rdar://9352731
llvm-svn: 135890