Made "call" another alias for "expression --", for people used to the GDB command.
Made "call" another alias for "expression --",
for people used to the GDB command.

<rdar://problem/12052072>


git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@161466 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb