[analyzer] Introduce ObjCMessage which represents both explicit ObjC message expressions and implicit
messages that are sent for handling properties in dot syntax.

Replace all direct uses of ObjCMessageExpr in the checkers and checker interface with ObjCMessage.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@124159 91177308-0d34-0410-b5e6-96231b3b80d8
13 files changed