[PATCH] Do not attach a debug location to code inserted by ARC / API for disabling DebugLocations

[Adrian Prantl]

Patch for review, mostly for the IRBuilder::DisableDebugLocations() part.

Do not attach a debug location to code inserted by ARC --
it would create a spurious line table entry at the closing } of the scope.

Also includes a patch for IRBuilder to temporarily disable debug locations from being attached to every instruction that is inserted. Useful if you want an instruction to be counted towards the prologue or if there _is_ no useful source location.

rdar://problem/13442648

thanks,
adrian

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