[PATCH] Bugfix for debug intrinsic handling in InstCombiner

[Adrian Prantl]

Bugfix for the debug intrinsic handling in InstCombiner:
Since we can't guarantee that the original dbg.declare instrinsic is removed
by LowerDbgDeclare(), we need to make sure that we are not inserting the same
dbg.value intrinsic over and over. 

This removes tons of redundant DIEs when compiling optimized code.

rdar://problem/13056109

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