Add member template 'Type::getAs<T>', which converts a Type* to a respective T*.
This method is intended to eventually replace the individual
Type::getAsXXXType<> methods.

The motivation behind this change is twofold:

1) Reduce redundant implementations of Type::getAsXXXType() methods. Most of
them are basically copy-and-paste.

2) By centralizing the implementation of the getAs<Type> logic we can more
smoothly move over to Doug Gregor's proposed canonical type smart pointer
scheme.

Along with this patch:

a) Removed 'Type::getAsPointerType()'; now clients use getAs<PointerType>.
b) Removed 'Type::getAsBlockPointerTypE()'; now clients use getAs<BlockPointerType>.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@76098 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGExpr.cpp b/lib/CodeGen/CGExpr.cpp
index 346b670..ab7b70e 100644
--- a/lib/CodeGen/CGExpr.cpp
+++ b/lib/CodeGen/CGExpr.cpp
@@ -934,7 +934,7 @@
     assert(E->getBase()->getType()->isVectorType());
     Base = EmitLValue(E->getBase());
   } else {
-    const PointerType *PT = E->getBase()->getType()->getAsPointerType();
+    const PointerType *PT = E->getBase()->getType()->getAs<PointerType>();
     llvm::Value *Ptr = EmitScalarExpr(E->getBase());
     Base = LValue::MakeAddr(Ptr, PT->getPointeeType().getCVRQualifiers());
   }
@@ -976,7 +976,7 @@
   if (E->isArrow()) {
     BaseValue = EmitScalarExpr(BaseExpr);
     const PointerType *PTy = 
-      BaseExpr->getType()->getAsPointerType();
+      BaseExpr->getType()->getAs<PointerType>();
     if (PTy->getPointeeType()->isUnionType())
       isUnion = true;
     CVRQualifiers = PTy->getPointeeType().getCVRQualifiers();
@@ -1317,7 +1317,7 @@
   assert(CalleeType->isFunctionPointerType() && 
          "Call must have function pointer type!");
 
-  QualType FnType = CalleeType->getAsPointerType()->getPointeeType();
+  QualType FnType = CalleeType->getAs<PointerType>()->getPointeeType();
   QualType ResultType = FnType->getAsFunctionType()->getResultType();
 
   CallArgList Args;