Adrian Prantl 8e1d6c013b Make SILDebugLocation a value member of SILInstruction again. ...

The overhead of uniquing the locations in a Densemap isn't worth any of
the potential memory savings: While this adds an extra pointer and
unsigned to each SILInstruction, any extra memory is completely lost in
the noise (measured on a release -emit-ir build of the x86_64 stdlib).
This is not too surpising as the ratio between SILInstructions and unique
SILLocations is not very high and the DenseMap also needs space.

<rdar://problem/22706994>

2016-02-19 13:41:54 -08:00

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