[X86] Add test case to demonstrate that we don't allow masks wider than 6 bits in the (shift x, (and y, mask)) patterns for the 64-bit memory form.
[X86] Add test case to demonstrate that we don't allow masks wider than 6 bits in the (shift x, (and y, mask)) patterns for the 64-bit memory form.

We allow wider than 5 bits in the 16 and 32 bit store forms. And we allow wider than 6 bits on the 64-bit regsiter form.:w

I'm assuming this was a mistake made back in r148024.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@308656 91177308-0d34-0410-b5e6-96231b3b80d8

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