For PR351:

* Place a try/catch block around the entire tool to Make sure std::string
  exceptions are caught and printed before exiting the tool.
* Make sure we catch unhandled exceptions at the top level so that we don't
  abort with a useless message but indicate than an unhandled exception was
  generated.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19192 91177308-0d34-0410-b5e6-96231b3b80d8

tools/bugpoint/bugpoint.cpp

@@ -51,10 +51,11 @@ int main(int argc, char **argv) {
     return D.run();
   } catch (ToolExecutionError &TEE) {
     std::cerr << "Tool execution error: " << TEE.what() << '\n';
-    return 1;
+  } catch (const std::string& msg) {
+    std::cerr << argv[0] << ": " << msg << "\n";
   } catch (...) {
     std::cerr << "Whoops, an exception leaked out of bugpoint.  "
               << "This is a bug in bugpoint!\n";
-    return 1;
   }
+  return 1;
 }