[LLVMdev] [patch] Remove getType() overrides from extractvalue and insertvalue

[John McCall]

Several instruction classes override getType() when the instruction  
always creates a particular type of value.  For example, the result of  
insertelement is always a vector, so InsertElementInst overrides  
getType() to return a VectorType*.  This makes perfect sense.   
However, ExtractValueInst and InsertValueInst override getType() to  
return a PointerType*, which does not make sense and is in fact never  
correct for the latter instruction;  this is probably a relic of an  
oversight during class creation.  So this patch simply removes these  
overrides, which I suppose is technically an API change.

John.

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