Fix ObjC block declarations.

Before: int ( ^ Block1) (int, int) = ^ (int i, int j)
After:  int (^Block1) (int, int) = ^(int i, int j)

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@171959 91177308-0d34-0410-b5e6-96231b3b80d8