[X86] Remove FMA3Info DenseMap. Break into sorted tables that we can binary search.

I separated out the rounding and broadcast groups into their own tables because it made the ordering in the main table easier.

Further splitting of the tables might make it possible to directly index using bits from the TSFlags, but its probably not worth it right now.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@336075 91177308-0d34-0410-b5e6-96231b3b80d8

Author: topperc

lib/Target/X86/MCTargetDesc/X86BaseInfo.h

@@ -580,7 +580,7 @@ namespace X86II {
   // getBaseOpcodeFor - This function returns the "base" X86 opcode for the
   // specified machine instruction.
   //
-  inline unsigned char getBaseOpcodeFor(uint64_t TSFlags) {
+  inline uint8_t getBaseOpcodeFor(uint64_t TSFlags) {
     return TSFlags >> X86II::OpcodeShift;
   }