cbac75a003
- Consider the case where `usedVGPRs` is zero.
- This fixes [SWDEV-228537](http://ontrack-internal.amd.com/browse/SWDEV-228537)
Change-Id: I8675311f5fe24fb59c5d45bada122afefb55b128
[ROCm/hip commit: 3a690e960f]