809c7e8551
The following sequence would drop the first store when eccBytes=4:
sb x0, 0(t0)
nop
sb x0, 4(t0)
nop
sb x0, 1(t0)
Because the first and second store are to different ECC granules, the
hazard check correctly allowed the second one to proceed, but the third
was merged with the second, even though it conflicted with the first.
So, don't allow the third to be merged with the second, since the second
stored to a different ECC granule.
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