FIX: duplicated elements in ObjC Block structure

[Saliev, Rafik F]

Hello

The attached patch fixes the bug when the block structure alignment algorithm causes duplicated elements inside the block info structure.
The cause of the bug: previous code assumes, that SmallVector::erase(first, last) removes elements inclusively, but this method removes by following formula: "[first, last)".

Best regards.
================
Rafik F. Saliev
Graphics Software Developer
Intel Corporation

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