<rdar://problem/13107151>

SBValueList was backed by a ValueObjectList. This caused us to lose track of the additional metadata in the ValueImpl that backs SBValue.
This checkin fixes that by backing SBValueList with ValueListImpl (that essentially wraps a vector<SBValue>).



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@174638 91177308-0d34-0410-b5e6-96231b3b80d8