[clang-diff] Refactor stop-after command-line flag

Summary:
Rename stop-after to stop-diff-after. When building LLVM with
-DLLVM_BUILD_LLVM_DYLIB=ON, stop-after collides with the stop-after
already present in LLVM.

Reviewers: johannes, arphaman

Subscribers: klimek, aheejin, cfe-commits

Differential Revision: https://reviews.llvm.org/D36989

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@311476 91177308-0d34-0410-b5e6-96231b3b80d8