* Remove isPointerType, isMethodType, etc... methods. Use isa<> instead
* Added specialization of isa for pointer types so that DerivedTypes.h doesn't
have to be #included to use isa<PointerType>(..)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2483 91177308-0d34-0410-b5e6-96231b3b80d8