[GVN] Invalidate cached info for phis when setting dead predecessors to undef

When GVN sets the incoming value for a phi to undef because the incoming block
is unreachable it needs to also invalidate the cached info for that phi in
MemoryDependenceAnalysis, otherwise later queries will return stale information.

Differential Revision: https://reviews.llvm.org/D51099

llvm-svn: 340529