DynamoRIO / DynamoRIO/drmemory

propagate ymm shadow values

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Bug-FalsePositive help wanted Migrated Priority-Medium Type-Feature
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Description

_From [bruen...@google.com](https://code.google.com/u/109494838902877177630/) on March 22, 2014 11:07:21_

xref issue #243 ymm are more complex as the shadow occupies two dwords, so I separated it from the xmm shadowing. it may well work fine in the slowpath if we enable it, but the fastpath definitely needs work to handle it.

_Original issue: http://code.google.com/p/drmemory/issues/detail?id=1485_

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