If a binary was stripped we sometimes didn't show the ivars of an Objective C...

If a binary was stripped we sometimes didn't show the ivars of an Objective C class correctly. Now we do as we consult the runtime data for the class so we don't have to have a symbol in the symbol table.

Fixed:
1 - try the symbol table symbol for an ObjC ivar and use it if available
2 - fall back to using the runtime data since it is slower to gather via memory read
3 - Fixed our hidden ivars test case to test this to ensure we don't regress
4 - split out a test case in the hidden ivars to cover only the part that was failing so we don't have an expected failure for all of the other content in the test.

<rdar://problem/18882687>

llvm-svn: 224306