[clang][Interp][NFC] Get ComplexType directly

Instead of doing a isa<> + getAs<>

Author: tbaederr

clang/lib/AST/Interp/ByteCodeExprGen.cpp

@@ -922,9 +922,9 @@ bool ByteCodeExprGen<Emitter>::VisitImplicitValueInitExpr(const ImplicitValueIni
     return true;
   }
 
-  if (QT->isAnyComplexType()) {
+  if (const auto *ComplexTy = E->getType()->getAs<ComplexType>()) {
     assert(Initializing);
-    QualType ElemQT = QT->getAs<ComplexType>()->getElementType();
+    QualType ElemQT = ComplexTy->getElementType();
     PrimType ElemT = classifyPrim(ElemQT);
     for (unsigned I = 0; I < 2; ++I) {
       if (!this->visitZeroInitializer(ElemT, ElemQT, E))
@@ -1098,13 +1098,13 @@ bool ByteCodeExprGen<Emitter>::VisitInitListExpr(const InitListExpr *E) {
     return true;
   }
 
-  if (T->isAnyComplexType()) {
+  if (const auto *ComplexTy = E->getType()->getAs<ComplexType>()) {
     unsigned NumInits = E->getNumInits();
 
     if (NumInits == 1)
       return this->delegate(E->inits()[0]);
 
-    QualType ElemQT = E->getType()->getAs<ComplexType>()->getElementType();
+    QualType ElemQT = ComplexTy->getElementType();
     PrimType ElemT = classifyPrim(ElemQT);
     if (NumInits == 0) {
       // Zero-initialize both elements.