ClangTool: strip -o from the command line

Summary:
This patch creates a new ArgumentsAdjuster, which removes all -o parameters from
the command line. This adjuster is inserted by default into the ClangTool pipeline.

Reviewers: klimek

CC: cfe-commits, revane

Differential Revision: http://llvm-reviews.chandlerc.com/D925

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@183398 91177308-0d34-0410-b5e6-96231b3b80d8