[SelectionDAG] Add FoldBUILD_VECTOR to simplify new BUILD_VECTOR nodes

	
Similar to FoldCONCAT_VECTORS, this patch adds FoldBUILD_VECTOR to simplify cases that can avoid the creation of the BUILD_VECTOR - if all the operands are UNDEF or if the BUILD_VECTOR simplifies to a copy.

This exposed an assumption in some AMDGPU code that getBuildVector was guaranteed to be a BUILD_VECTOR node that I've tried to handle.	
	
Differential Revision: https://reviews.llvm.org/D53760

llvm-svn: 345578