[analyzer] RetainCount: Accept more "safe" CFRetain wrappers.

r315736 added support for the misplaced CF_RETURNS_RETAINED annotation on
CFRetain() wrappers. It works by trusting the function's name (seeing if it
confirms to the CoreFoundation naming convention) rather than the annotation.

There are more false positives caused by users using a different naming
convention, namely starting the function name with "retain" or "release"
rather than suffixing it with "retain" or "release" respectively.

Because this isn't according to the naming convention, these functions
are usually inlined and the annotation is therefore ignored, which is correct.
But sometimes we run out of inlining stack depth and the function is
evaluated conservatively and then the annotation is trusted.

Add support for the "alternative" naming convention and test the situation when
we're running out of inlining stack depth.

rdar://problem/18270122

Differential Revision: https://reviews.llvm.org/D45117

llvm-svn: 330375