Add a missing declaration of Log in lldb.

Bill accepted this commit for the 3.4 release.

The build was failing with:
/tmp/buildd/llvm-toolchain-3.4-3.4~+/tools/lldb/source/Host/common/Host.cpp:1222:30: error: request for member 'Printf' in 'log', which is of non-class type 'double(double)throw ()'
log->Printf("Host::GetLLDBPath(ePathTypeLLDBTempSystemDir) => '%s'", g_lldb_tmp_dir.GetCString());
Rewrite the static analyzer changes description for the 3.4 release.

After chatting with Anna Zaks, she believes that my code samples were
more bugs in the previous releases of the static analyzer.