[PATCH] Fixed STRD register classes for Thumb2 mode.

[Tim Northover]

  Hi Stepan,

  The code changes look fine, but I think using grep is discouraged in tests these days.

  It would be better to use FileCheck and positively detect each line you want (for example the passing lines could start failing, and as long as the error message they print isn't "invalid operand for instruction" this test would still pass).

http://llvm-reviews.chandlerc.com/D3287