[X86] Rename combineScalarToVector to combineSCALAR_TO_VECTOR. NFC.

Match the file style of using the ISD NodeType name for the combine/lower method name.

Author: RKSimon

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -58572,8 +58572,8 @@ static SDValue combineEXTRACT_SUBVECTOR(SDNode *N, SelectionDAG &DAG,
   return SDValue();
 }
 
-static SDValue combineScalarToVector(SDNode *N, SelectionDAG &DAG,
-                                     const X86Subtarget &Subtarget) {
+static SDValue combineSCALAR_TO_VECTOR(SDNode *N, SelectionDAG &DAG,
+                                       const X86Subtarget &Subtarget) {
   EVT VT = N->getValueType(0);
   SDValue Src = N->getOperand(0);
   SDLoc DL(N);
@@ -59266,7 +59266,7 @@ SDValue X86TargetLowering::PerformDAGCombine(SDNode *N,
   // clang-format off
   default: break;
   case ISD::SCALAR_TO_VECTOR:
-    return combineScalarToVector(N, DAG, Subtarget);
+    return combineSCALAR_TO_VECTOR(N, DAG, Subtarget);
   case ISD::EXTRACT_VECTOR_ELT:
   case X86ISD::PEXTRW:
   case X86ISD::PEXTRB: