[globalisel][tablegen] Multi-insn emission requires that BuildMIAction support not being linked to an InstructionMatcher. NFC
[globalisel][tablegen] Multi-insn emission requires that BuildMIAction support not being linked to an InstructionMatcher. NFC

When multi-instruction emission is supported, it will no longer be guaranteed
that every BuildMIAction has a corresponding matched instruction. BuildMIAction
should support not having one to cover the case where a rule produces more
instructions than it matched.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@316463 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 8e1e4b94b8ca1b2738e7134d4330bb176260f61f)

apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm