Remove TimeValue class

Summary:
All uses have been replaced by appropriate std::chrono types, and the class is
now unused.

Reviewers: zturner, mehdi_amini

Subscribers: llvm-commits, mgorny

Differential Revision: https://reviews.llvm.org/D26447

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@287094 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed