Cleanup after r241809 - remove uncessary call to std::sort

Cleanup after r241809 - remove uncessary call to std::sort

Summary:
The iteration order within a member of DepCands is deterministic
and therefore we don't have to sort the accesses within a member.
We also don't have to copy the indices of the pointers into a
vector, since we can iterate over the members of the class.

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D11145

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242033 91177308-0d34-0410-b5e6-96231b3b80d8