[ObjCARC] Account for funclet token in storeStrong transform

When creating a call to storeStrong in ObjCARCContract, ensure the call
gets the correct funclet token, otherwise WinEHPrepare will turn the
call (and all subsequent instructions) into unreachable.

We already have logic to do this for the ARC autorelease elision marker;
factor that out into a common function that's used for both. These are
the only two places in this transform that create call instructions.

Differential Revision: https://reviews.llvm.org/D45857

llvm-svn: 330487

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