MIPS: mark intrinsics IntrNoMem so all patterns using them are consistent.
MIPS: mark intrinsics IntrNoMem so all patterns using them are consistent.

This is apparently a bit of a white lie (they can affect DSPControl for
overflow etc) but similar to how we currently handle floating-point operations.
When it becomes relevant the whole lot can be reviewed properly.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@199718 91177308-0d34-0410-b5e6-96231b3b80d8

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