Fix a bug in the register allocator around pair allocation.

We may get hints that do not work with the current implementation
of register pairs, which forces the allocation of (low + 1)
for the high register. For example, if the hint is EBX, we will
allocate ESP for the high register.


Change-Id: I371ebb0c61568f09d12eb9ab815c0bf0ea02d49b
4 files changed