swift234

[+0 self][arc] When checking if a cond_br touches reference counts, only perform AA on the operands passed to other blocks, not the integer that is being switched upon.

Perf Results:

RIGHT - Before (ms)
LEFT - After (ms)

TITLE               LEFT         RIGHT        RIGHT/LEFT
InsertionSort       103721.00    110326.00    1.06
NSXMLParser         27031.00     29763.00     1.10

rdar://20355793

Swift SVN r26784