Don't compute modulus of hash if it is smaller than the bucket count.

This cleans up a previous optimization attempt in hash, and results in
additional performance improvements over that previous attempt. Additionally
this new optimization does not hinder the power of 2 bucket count optimization.


git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@275114 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed