[PATCH] Fix DeleteDeadVarargs not to crash on functions referenced by BlockAddresses

[Mark Seaborn]

Fix DeleteDeadVarargs not to crash on functions referenced by BlockAddresses

This pass was assuming that if hasAddressTaken() returns false for a
function, the function's only uses are call sites.  That's not true
because there can be references by BlockAddresses too.

Fix the pass to handle this case.  Fix
BlockAddress::replaceUsesOfWithOnConstant() to allow a function's type
to be changed by RAUW'ing the function with a bitcast of the recreated
function.
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