This patchset:
* propagates alignment attributes from memref operations into the SPIR-V
dialect,
* fixes an error in the logic which previously propagated alignment
attributes but did not add other MemoryAccess attributes.
* adds a failure condition in the case where the alignment attribute
from the memref dialect (64-bit wide) does not fit in SPIR-V's alignment
attribute (specified to be 32-bit wide).
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