Target::m_suppress_synthetic_value was a hack required to disable synthetic values while passing an SBValue to a synthetic child provider, or incur an endless recursion
Now that SBValues can be setup to ignore synthetic values, this is no longer necessary, and so m_suppress_synthetic_value can go away

Another Hack Bites the Dust



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@191338 91177308-0d34-0410-b5e6-96231b3b80d8