[NFC][CLANG] Fix nullptr dereference issue in SetValueDataBasedOnQualType()

[Manna]

Summary

This patch uses castAs instead of getAs which will assert if the type doesn't match in SetValueDataBasedOnQualType(clang::​Value &, unsigned long long).

[Manna]

I have updated PR.

[Manna]

Thank you @erichkeane for reviews!

clang/lib/Interpreter/Interpreter.cpp

__clang_Interpreter_SetValueNoAlloc(void *This, void *OutVal,
   VRef = Value(static_cast<Interpreter *>(This), OpaqueType);
 }
 
 static void SetValueDataBasedOnQualType(Value &V, unsigned long long Data) {
   QualType QT = V.getType();
   if (const auto *ET = QT->getAs<EnumType>())
     QT = ET->getDecl()->getIntegerType();
 
-  switch (QT->getAs<BuiltinType>()->getKind()) {
+  switch (QT->castAs<BuiltinType>()->getKind()) {
   default:
     llvm_unreachable("unknown type kind!");
 #define X(type, name)                                                          \
   case BuiltinType::name:                                                      \
     V.set##name(Data);                                                         \
     break;
     REPL_BUILTIN_TYPES
 #undef X