Added support for constraints 'I', 'J', 'L', 'B', 'C', 'Kf', 'DA', 'DB'. See https://gcc.gnu.org/onlinedocs/gcc/Machine-Constraints.html#Machine-Constraints. Reviewers: arsenm, rampitec Differential Revision: https://reviews.llvm.org/D81657
Differential Revision: https://reviews.llvm.org/D77329
Need to override convertConstraint to recognise amdgpu specific register names. Differential Revision: https://reviews.llvm.org/D44533 llvm-svn: 328359