enable fast isel tablegen files for Mips

[dsanders]

LGTM.

There's no functional change so no test is required.

lib/Target/Mips/CMakeLists.txt

 set(LLVM_TARGET_DEFINITIONS Mips.td)
 
 tablegen(LLVM MipsGenRegisterInfo.inc -gen-register-info)
 tablegen(LLVM MipsGenInstrInfo.inc -gen-instr-info)
 tablegen(LLVM MipsGenDisassemblerTables.inc -gen-disassembler)
 tablegen(LLVM MipsGenCodeEmitter.inc -gen-emitter)
 tablegen(LLVM MipsGenMCCodeEmitter.inc -gen-emitter -mc-emitter)
 tablegen(LLVM MipsGenAsmWriter.inc -gen-asm-writer)
 tablegen(LLVM MipsGenDAGISel.inc -gen-dag-isel)
+tablegen(LLVM MipsGenFastISel.inc -gen-fast-isel)
 tablegen(LLVM MipsGenCallingConv.inc -gen-callingconv)
 tablegen(LLVM MipsGenSubtargetInfo.inc -gen-subtarget)
 tablegen(LLVM MipsGenAsmMatcher.inc -gen-asm-matcher)
 tablegen(LLVM MipsGenMCPseudoLowering.inc -gen-pseudo-lowering)
 add_public_tablegen_target(MipsCommonTableGen)
 
 add_llvm_target(MipsCodeGen
   Mips16FrameLowering.cpp

lib/Target/Mips/Makefile

 ##===- lib/Target/Mips/Makefile ----------------------------*- Makefile -*-===##
 #
 #                     The LLVM Compiler Infrastructure
 #
 # This file is distributed under the University of Illinois Open Source
 # License. See LICENSE.TXT for details.
 #
 ##===----------------------------------------------------------------------===##
 
 LEVEL = ../../..
 LIBRARYNAME = LLVMMipsCodeGen
 TARGET = Mips
 
 # Make sure that tblgen is run, first thing.
 BUILT_SOURCES = MipsGenRegisterInfo.inc MipsGenInstrInfo.inc \
-                MipsGenAsmWriter.inc MipsGenCodeEmitter.inc \
+                MipsGenAsmWriter.inc MipsGenFastISel.inc MipsGenCodeEmitter.inc \
                 MipsGenDAGISel.inc MipsGenCallingConv.inc \
                 MipsGenSubtargetInfo.inc MipsGenMCCodeEmitter.inc \
                 MipsGenDisassemblerTables.inc \
                 MipsGenMCPseudoLowering.inc MipsGenAsmMatcher.inc
 
 DIRS = InstPrinter Disassembler AsmParser TargetInfo MCTargetDesc
 
 include $(LEVEL)/Makefile.common