AMDGPU: Remove global isGCN predicates
These are problematic because they apply to everything,
and can easily clobber whatever more specific predicate
you are trying to add to a function.
Currently instructions use SubtargetPredicate/PredicateControl
to apply this to patterns applied to an instruction definition,
but not to free standing Pats. Add a wrapper around Pat
so the special PredicateControls requirements can be appended
to the final predicate list like how Mips does it.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@314742
91177308-0d34-0410-b5e6-
96231b3b80d8
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