FIX #2047: Windows (and older Unixes): align info tables to 4 bytes, not 2
Perhaps in the past '.align 2' meant align to 4 bytes, but nowadays it means align to 2 bytes. The compacting collector requires info tables to be aligned to 4 bytes, because it stores tag bits in the low 2 bits. This only affects -fvia-C - the native code generator was already emitting the correct alignment. The incorrect alignment might well have been adversely affecting performance with -fvia-C on Windows.
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