Evgeniy Stepanov 79ca0fd1a0 [msan] Update origin for the entire destination range on memory store. ...

Previously we always stored 4 bytes of origin at the destination address
even for 8-byte (and longer) stores.

This should fix rare missing, or incorrect, origin stacks in MSan reports.

llvm-svn: 226658

2015-01-21 13:21:31 +00:00

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