The pattern optimizations in GlobalISelMatchTable.cpp can extract common
predicates out of pattern alternatives by putting the pattern alternatives into
a GroupMatcher and moving common predicates into the GroupMatcher's predicate
list. This patch adds checks to avoid hoisting a common predicate before
matchers that record named operands that the predicate uses, which would lead
to segfaults when the imported patterns are matched.
See the added test for a concrete example inspired by the AMDGPU backend.
This fixes a bug encountered in #143881.
9df83619fb