[PATCH] [Thumb1] Re-write emitThumbRegPlusImmediate

[Oliver Stannard]

* Use existing RoundUpToAlignment
* Remove isMul4, as it is unused in release builds
* Assert on a case we could handle, but currently don't (and don't need to)
* Don't fall back to the const pool when we don't have an extra instruction but also don't need one (I think this case is currently unused)

http://reviews.llvm.org/D6211

Files:
  include/llvm/Support/MathExtras.h
  lib/Target/ARM/Thumb1RegisterInfo.cpp
  test/CodeGen/ARM/thumb1-varalloc.ll
  test/CodeGen/Thumb/large-stack.ll
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