Fix minor bugs in TestExprs and TestAliases to fix buildbot breakage
- 'run' alias no longer includes the '--' for positional arguments... does not seem like a real bug.
- 2.234f is not a great number for the float tests (due to precision/printing issues) so use 0.5f instead



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@190100 91177308-0d34-0410-b5e6-96231b3b80d8
Restore -- "end of args" marker for shell

I accidentally dropped this in r189879 in the change from /bin/bash to
/bin/sh.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@190103 91177308-0d34-0410-b5e6-96231b3b80d8
Re-enable TestRegisters and TestTargetWatchAddress on Linux
- TestRegisters passes locally (llvm.org/pr16301 no longer reproduces) -- verifying this on buildbots
- TestTargetWatchAddress also passes locally, and referenced llvm.org/pr14323 which is now closed



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@190104 91177308-0d34-0410-b5e6-96231b3b80d8