Remove unused method Job::AddCommand.

I was going to update the comment referring to PipedJob, which was removed
some time ago, but then it turned out that this method is not actually used
at all.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@190171 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Driver/Job.h

@@ -38,10 +38,6 @@ public:
   virtual ~Job();
 
   JobClass getKind() const { return Kind; }
-
-  /// addCommand - Append a command to the current job, which must be
-  /// either a piped job or a job list.
-  void addCommand(Command *C);
 };
 
   /// Command - An executable path/name and argument vector to

lib/Driver/Job.cpp

@@ -32,8 +32,3 @@ JobList::~JobList() {
 void JobList::clear() {
   DeleteContainerPointers(Jobs);
 }
-
-void Job::addCommand(Command *C) {
-  cast<JobList>(this)->addJob(C);
-}
-