Added cursor visitor that takes a block as an argument.  Tested compiling
libclang with both clang -fblocks and gcc (no blocks support).  Only exposed in
the header to compilers that do have blocks support.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@118170 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed