rdar://problem/11584012

Refactorings of watchpoint creation APIs so that SBTarget::WatchAddress(), SBValue::Watch(), and SBValue::WatchPointee()
now take an additional 'SBError &error' parameter (at the end) to contain the reason if there is some failure in the
operation.  Update 'watchpoint set variable/expression' commands to take advantage of that.

Update existing test cases to reflect the API change and add test cases to verify that the SBError mechanism works for
SBTarget::WatchAddress() by passing an invalid watch_size.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@157964 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/source/API/SBWatchpoint.cpp b/source/API/SBWatchpoint.cpp
index fd505ae..76ce57c 100644
--- a/source/API/SBWatchpoint.cpp
+++ b/source/API/SBWatchpoint.cpp
@@ -87,22 +87,7 @@
 bool
 SBWatchpoint::IsValid() const
 {
-    lldb::WatchpointSP watchpoint_sp(GetSP());
-    if (watchpoint_sp && watchpoint_sp->GetError().Success())
-        return true;
-    return false;
-}
-
-SBError
-SBWatchpoint::GetError ()
-{
-    SBError sb_error;
-    lldb::WatchpointSP watchpoint_sp(GetSP());
-    if (watchpoint_sp)
-    {
-        sb_error.SetError(watchpoint_sp->GetError());
-    }
-    return sb_error;
+    return m_opaque_sp;
 }
 
 int32_t