Change all the Type::getAsFoo() methods to specializations of Type::getAs().
Several of the existing methods were identical to their respective
specializations, and so have been removed entirely.  Several more 'leaf'
optimizations were introduced.

The getAsFoo() methods which imposed extra conditions, like
getAsObjCInterfacePointerType(), have been left in place.

llvm-svn: 82501
diff --git a/clang/lib/Frontend/PCHReader.cpp b/clang/lib/Frontend/PCHReader.cpp
index 9c855eb..e85f58b 100644
--- a/clang/lib/Frontend/PCHReader.cpp
+++ b/clang/lib/Frontend/PCHReader.cpp
@@ -1536,7 +1536,7 @@
   if (unsigned File = SpecialTypes[pch::SPECIAL_TYPE_FILE]) {
     QualType FileType = GetType(File);
     assert(!FileType.isNull() && "FILE type is NULL");
-    if (const TypedefType *Typedef = FileType->getAsTypedefType())
+    if (const TypedefType *Typedef = FileType->getAs<TypedefType>())
       Context->setFILEDecl(Typedef->getDecl());
     else {
       const TagType *Tag = FileType->getAs<TagType>();
@@ -1547,7 +1547,7 @@
   if (unsigned Jmp_buf = SpecialTypes[pch::SPECIAL_TYPE_jmp_buf]) {
     QualType Jmp_bufType = GetType(Jmp_buf);
     assert(!Jmp_bufType.isNull() && "jmp_bug type is NULL");
-    if (const TypedefType *Typedef = Jmp_bufType->getAsTypedefType())
+    if (const TypedefType *Typedef = Jmp_bufType->getAs<TypedefType>())
       Context->setjmp_bufDecl(Typedef->getDecl());
     else {
       const TagType *Tag = Jmp_bufType->getAs<TagType>();
@@ -1558,7 +1558,7 @@
   if (unsigned Sigjmp_buf = SpecialTypes[pch::SPECIAL_TYPE_sigjmp_buf]) {
     QualType Sigjmp_bufType = GetType(Sigjmp_buf);
     assert(!Sigjmp_bufType.isNull() && "sigjmp_buf type is NULL");
-    if (const TypedefType *Typedef = Sigjmp_bufType->getAsTypedefType())
+    if (const TypedefType *Typedef = Sigjmp_bufType->getAs<TypedefType>())
       Context->setsigjmp_bufDecl(Typedef->getDecl());
     else {
       const TagType *Tag = Sigjmp_bufType->getAs<TagType>();