[FastISel][ARM] Fix a bug in the integer materialization code.
[FastISel][ARM] Fix a bug in the integer materialization code.

getRegClassFor returns the incorrect register class when in Thumb2 mode.
This fix simply manually selects the register class as in the code just a few
lines above.

There is no test case for this code, because the code is currently
unreachable. This will be changed in a future commit and existing test
cases will exercise this code.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@215583 91177308-0d34-0410-b5e6-96231b3b80d8

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