Disable the "pretty stack trace" signal handler,

which can conflict with accurate crash reporting
in multithreaded contexts.

llvm-svn: 163282

lldb/source/Expression/ClangExpressionParser.cpp

@@ -195,6 +195,8 @@ ClangExpressionParser::ClangExpressionParser (ExecutionContextScope *exe_scope,
             llvm::InitializeAllAsmPrinters();
             llvm::InitializeAllTargetMCs();
             llvm::InitializeAllDisassemblers();
+            
+            llvm::DisablePrettyStackTrace = true;
         }
     } InitializeLLVM;