[clang][AArch64][SVE] Handle PRValue under VLAT <-> VLST cast

This change fixes the crash that PRValue cannot be handled by
EmitLValue.

Differential Revision: https://reviews.llvm.org/D105097

Author: junparser

clang/lib/CodeGen/CGExprScalar.cpp

@@ -2095,24 +2095,11 @@ Value *ScalarExprEmitter::VisitCastExpr(CastExpr *CE) {
          isa<llvm::ScalableVectorType>(DstTy)) ||
         (isa<llvm::ScalableVectorType>(SrcTy) &&
          isa<llvm::FixedVectorType>(DstTy))) {
-      if (const CallExpr *CE = dyn_cast<CallExpr>(E)) {
-        // Call expressions can't have a scalar return unless the return type
-        // is a reference type so an lvalue can't be emitted. Create a temp
-        // alloca to store the call, bitcast the address then load.
-        QualType RetTy = CE->getCallReturnType(CGF.getContext());
-        Address Addr =
-            CGF.CreateDefaultAlignTempAlloca(SrcTy, "saved-call-rvalue");
-        LValue LV = CGF.MakeAddrLValue(Addr, RetTy);
-        CGF.EmitStoreOfScalar(Src, LV);
-        Addr = Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(DestTy),
-                                            "castFixedSve");
-        LValue DestLV = CGF.MakeAddrLValue(Addr, DestTy);
-        DestLV.setTBAAInfo(TBAAAccessInfo::getMayAliasInfo());
-        return EmitLoadOfLValue(DestLV, CE->getExprLoc());
-      }
-
-      Address Addr = EmitLValue(E).getAddress(CGF);
-      Addr = Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(DestTy));
+      Address Addr = CGF.CreateDefaultAlignTempAlloca(SrcTy, "saved-value");
+      LValue LV = CGF.MakeAddrLValue(Addr, E->getType());
+      CGF.EmitStoreOfScalar(Src, LV);
+      Addr = Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(DestTy),
+                                          "castFixedSve");
       LValue DestLV = CGF.MakeAddrLValue(Addr, DestTy);
       DestLV.setTBAAInfo(TBAAAccessInfo::getMayAliasInfo());
       return EmitLoadOfLValue(DestLV, CE->getExprLoc());