[llvm-commits] First patch to add support for variable address spaces to optimizers

[Villmow, Micah]

This patch starts enabling proper use of the variable address space throughout LLVM.
What this does is when it is known, it passes in the address space to the data layout for some functions.
The next patch will contain the more intrusive changes of getIntPtrType/get*PtrTy/getPointerTy.

Micah
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