rdar://problem/11597911

Fix confusing error message about "expression did not evaluate to an address" when doing 'watchpoint set expression".
Instead of using 0 as the fail_value when invoking ValueObject::GetValueAsUnsigned(), modify the API to take an addition
bool pointer (defaults to NULL) to indicate success/failure of value conversion.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@158016 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed