Fix issue 13748 -- benchmark druntime/benchmark/aabench/string.d fails
Merge pull request #1025 from schveiguy/fix13748

Fix issue 13748 -- benchmark druntime/benchmark/aabench/string.d fails
Add missing declarations for Solaris.

- core.sys.posix.grp is not yet implemented
- typo in core.sys.posix.unistd.d
GC: precalculate shiftBy
Merge pull request #1027 from rainers/precalc_shiftBy

Optimize GC: precalculate shiftBy
Merge pull request #1026 from redstar/solaris

Add missing declarations for Solaris.