[serialization] Refactor from large SILInstruction loop, writeNoOperandLayout handler.

NFC.

Author: gottesmm

lib/Serialization/SerializeSIL.cpp

@@ -248,6 +248,12 @@ namespace {
     void writeSILBlock(const SILModule *SILMod);
     void writeIndexTables();
 
+    void writeNoOperandLayout(const SILInstruction *I) {
+      unsigned abbrCode = SILAbbrCodes[SILInstNoOperandLayout::Code];
+      SILInstNoOperandLayout::emitRecord(Out, ScratchRecord, abbrCode,
+                                         (unsigned)I->getKind());
+    }
+
     void writeConversionLikeInstruction(const SingleValueInstruction *I,
                                         unsigned attrs);
     void writeOneTypeLayout(SILInstructionKind valueKind,
@@ -763,9 +769,7 @@ void SILSerializer::writeSILInstruction(const SILInstruction &SI) {
 
   case SILInstructionKind::UnwindInst:
   case SILInstructionKind::UnreachableInst: {
-    unsigned abbrCode = SILAbbrCodes[SILInstNoOperandLayout::Code];
-    SILInstNoOperandLayout::emitRecord(Out, ScratchRecord, abbrCode,
-                                       (unsigned)SI.getKind());
+    writeNoOperandLayout(&SI);
     break;
   }
   case SILInstructionKind::AllocExistentialBoxInst: