[CIR][CUDA] Lowering device and shared variables #1438
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Currently
__shared__and__constant__variables are ignored by CodeGen. This patch fixes this.(It is also fixed in #1436 .)
Device and constant variables should be marked as
externally_initialized, as they might be initialized by host, rather than on device. We can't identify which variables are device ones at lowering stage, so this patch adds a new attribute for it in CodeGen.Similar to
__global__functions, global variables on device corresponds to "shadow" variables on host, and they must be registered to their counterpart. I added aCUDAShadowNameAttrin this patch for later use, but I didn't insert code to actually generate it.