Rework a few things about how we emit ObjC's for enumeration statement.

In particular, the iteration variable (if present) should be created and
destroyed in a narrow span around the loop body, and the body should
be emitted in a cleanup scope in case it's not a compound statement.
Otherwise, rename a few variables and use phis instead of temporary
variables for the index and buffer count.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@122988 91177308-0d34-0410-b5e6-96231b3b80d8

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