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This adds debug tracing to the table-generated assembly instruction matcher, enabled by the -debug-only=asm-matcher option. The changes in the target AsmParsers are to add an MCInstrInfo reference under a consistent name, so that we can use it from table-generated code. This was already being used this way for targets that use deprecation warnings, but 5 targets did not have it, and Hexagon had it under a different name to the other backends. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@315445 91177308-0d34-0410-b5e6-96231b3b80d8