[ObjC][ARC] Avoid -Warc-performSelector-leaks for performSelector variations

[ObjC][ARC] Avoid -Warc-performSelector-leaks for performSelector variations
that became supported after r297019

The commit r297019 expanded the performSelector ObjC method family heuristic
to ensure that -Wobjc-unsafe-perform-selector covers all performSelector
variations. However, this made the -Warc-performSelector-leaks too noisy, as
that warning produces mostly false positives since the selector is unknown.
This commit reverts the ObjC method family heuristics introduced in r297019.
This ensures that -Warc-performSelector-leaks isn't too noisy. The commit still
preserves the coverage of -Wobjc-unsafe-perform-selector.

rdar://31124629

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@298587 91177308-0d34-0410-b5e6-96231b3b80d8