[X86][Haswell][SchedModel] Fix WriteMULm latency.
[X86][Haswell][SchedModel] Fix WriteMULm latency.

The latency for the WriteMULm class was set to 4, which is actually lower than the latency for WriteMULr (5). 
A better estimate would be 4 added to WriteMULr, that is, 9.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@230634 91177308-0d34-0410-b5e6-96231b3b80d8

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