Arnold Schwaighofer c187c8ac13 SIL: Replace uses of getReferencedFunction() by getReferencedFunctionOrNull() and getInitialReferencedFunction() ...

With the advent of dynamic_function_ref the actual callee of such a ref
my vary. Optimizations should not assume to know the content of a
function referenced by dynamic_function_ref. Introduce
getReferencedFunctionOrNull which will return null for such function
refs. And getInitialReferencedFunction to return the referenced
function.
Use as appropriate.

rdar://50959798

2019-05-26 08:58:14 -07:00

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