[X86][MemFold] Stop emitting Header for X86 fold tables

[skan]

LGTM

llvm/test/TableGen/x86-auto-memfold.td

 // RUN: llvm-tblgen -gen-x86-fold-tables -asmwriternum=1 %p/../../lib/Target/X86/X86.td -I %p/../../include -I %p/../../lib/Target/X86/ -I %p/../../include/ -I %p/../../lib/Target/ --write-if-changed  -o %t1
-// RUN: cmp  --ignore-initial=0:568 %p/../../lib/Target/X86/X86MemFoldTables.inc %t1
+// RUN: cmp %p/../../lib/Target/X86/X86MemFoldTables.inc %t1

llvm/utils/TableGen/X86FoldTablesEmitter.cpp

if (MemInSize == RegInSize && MemOutSize == RegOutSize) {
     if (isRegisterOperand(RegOpRec) && isMemoryOperand(MemOpRec) &&
         getRegOperandSize(RegOpRec) == getMemOperandSize(MemOpRec))
       addEntryWithFlags(Table0, RegInstr, MemInstr, S, 0, IsManual);
   }
 }
 
 void X86FoldTablesEmitter::run(raw_ostream &o) {
   formatted_raw_ostream OS(o);
-  emitSourceFileHeader("X86 fold tables", OS);
 
   // Holds all memory instructions
   std::vector<const CodeGenInstruction *> MemInsts;
   // Holds all register instructions - divided according to opcode.
   std::map<uint8_t, std::vector<const CodeGenInstruction *>> RegInsts;
 
   ArrayRef<const CodeGenInstruction *> NumberedInstructions =
       Target.getInstructionsByEnumValue();