Bug #:

Submitted by:
Reviewed by:
Implement FIXME's for signed/unsigned operands in UsualArithmeticConversions()...
- Added GetIntegerRank() and used it in the appropriate places.
- Added ConvertSignedWithGreaterRankThanUnsigned(), with a FIXME.
Misc...converted a bunch of static_cast usage to dyn_cast (in Type.cpp)

A and handled signed/unsigned combos.

llvm-svn: 39415