Add extra acceptable characters to CMICmdArgValFile (MI)

[ki.stfu]

Summary

Improve CMICmdArgValFile::IsValidChars to accept extra characters that can be in file name:

.'\"`@#$%^&*()_+-={}[]|

Enable MiSyntaxTestCase.test_lldbmi_specialchars test.

All test pass on OS X.

test/tools/lldb-mi/TestMiSyntax.py

def test_lldbmi_tokens(self):
 
         # Exit
         self.runCmd("0000000000000000000003-exec-continue")
         self.expect("0000000000000000000003\^running")
         self.expect("\*stopped,reason=\"exited-normally\"")
 
     @lldbmi_test
     @expectedFailureWindows("llvm.org/pr22274: need a pexpect replacement for windows")
-    @unittest2.skip("lldb-mi doesn't handle special chars properly")
     def test_lldbmi_specialchars(self):
         """Test that 'lldb-mi --interpreter' handles complicated strings."""
 
         self.spawnLldbMi(args = None)
 
         # Create alias for myexe
         complicated_myexe = "C--mpl-x file's`s @#$%^&*()_+-={}[]| name"
         if os.path.exists(complicated_myexe):

tools/lldb-mi/MICmdArgValFile.cpp

 // Type:    Method.
 // Args:    vrText  - (R) The text data to examine.
 // Return:  bool - True = yes valid, false = one or more chars is valid.
 // Throws:  None.
 //--
 bool
 CMICmdArgValFile::IsValidChars(const CMIUtilString &vrText) const
 {
+    static CMIUtilString s_strSpecialCharacters(".'\"`@#$%^&*()_+-={}[]| ");
     const MIchar *pPtr = const_cast<MIchar *>(vrText.c_str());
     for (MIuint i = 0; i < vrText.length(); i++, pPtr++)
     {
         const MIchar c = *pPtr;
         if (::isalnum((int)c) == 0)
         {
-            if ((c != '.') && (c != '-') && (c != '_'))
+            if (s_strSpecialCharacters.find(c) == CMIUtilString::npos)
                 return false;
         }
     }
 
     return true;
 }