Implement objective-c++'s block pointer type matching involving
types which are contravariance in argument types and covariance
in return types. // rdar://8979379.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@125445 91177308-0d34-0410-b5e6-96231b3b80d8
7 files changed