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When performing a NSFastEnumeration, the compiler synthesizes a call to
`countByEnumeratingWithState:objects:count:` where the `count` parameter
is of type `NSUInteger` and the return type is a `NSUInteger`. We would
previously always use a `UnsignedLongTy` for the `NSUInteger` type. On
32-bit targets, `long` is 32-bits which is the same as `unsigned int`.
Most 64-bit targets are LP64, where `long` is 64-bits. However, on
LLP64 targets, such as Windows, `long` is 32-bits. Introduce new
`getNSUIntegerType` and `getNSIntegerType` helpers to allow us to
determine the correct type for the `NSUInteger` type. Wire those
through into the generation of the message dispatch to the selector.
llvm-svn: 312835
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