[AMDGPU] Do not allow register coalescer to create big superregs

[AMDGPU] Do not allow register coalescer to create big superregs

Limit register coalescer by not allowing it to artificially increase
size of registers beyond dword. Such super-registers are in fact
register sequences and not distinct HW registers.

With more super-regs we would need to allocate adjacent registers
and constraint regalloc more than needed. Moreover, our super
registers are overlapping. For instance we have VGPR0_VGPR1_VGPR2,
VGPR1_VGPR2_VGPR3, VGPR2_VGPR3_VGPR4 etc, which complicates registers
allocation even more, resulting in excessive spilling.

Differential Revision: https://reviews.llvm.org/D28782

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@292413 91177308-0d34-0410-b5e6-96231b3b80d8