[NFC][ScopBuilder] Move addUserContext to ScopBuilder

Scope of changes:
1) Moved addUserContext to ScopBuilder.
2) Moved command line option UserContextStr to ScopBuilder.

Differential Revision: https://reviews.llvm.org/D63740

llvm-svn: 366266
GitOrigin-RevId: fdc61bce9470ca7e80125b54d6dfbf24a3cc68c5
4 files changed