+ specified progress information

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@174942 91177308-0d34-0410-b5e6-96231b3b80d8
Fix a bug reduced from a crash when trying to use modules with libc++. We check
the linkage of functions and variables while merging declarations from modules,
and we don't necessarily have enough of the rest of the AST loaded at that
point to allow us to compute linkage, so serialize it instead.


git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@174943 91177308-0d34-0410-b5e6-96231b3b80d8
Properly assemble PHIs after a null-checked invoke of objc_msgSend.
rdar://12046763

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@174946 91177308-0d34-0410-b5e6-96231b3b80d8