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These are all co-processor registers, with the exception of the floating-point deferred-trap queue register. Although these will not be lowered automatically by any instructions, it allows the use of co-processor instructions implemented by inline-assembly. Code Reviewed at http://reviews.llvm.org/D17133, with the exception of a very small change in brace placement in SparcInstrInfo.td, which was formerly causing a problem in the disassembly of the %fq register. llvm-svn: 262133