Added method to exploitability class which checks if a given address contains all ascii characters.

BUG=NONE
TEST=ExploitabilityTest.TestWindowsEngine
Review URL: http://breakpad.appspot.com/207001

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@706 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/google_breakpad/processor/exploitability.h

@@ -54,6 +54,7 @@ class Exploitability {
                                                    ProcessState *process_state);
 
   ExploitabilityRating CheckExploitability();
+  bool AddressIsAscii(u_int64_t);
 
  protected:
   Exploitability(Minidump *dump,