Add support for clang 3.9 (trunk) (see bug #32)

The fields without file defintion have been added to the list
of tags which need to be skipped.

Chery-picked from develop branch

Author: iMichka

pygccxml/parser/scanner.py

@@ -261,9 +261,19 @@ def __read_location(self, decl, attrs):
         if "CastXML" in utils.xml_generator:
             # These fields are generated by clang, and have no location.
             # Just set an empty location for them. Gccxml does not have
-            # this problem. See also bug #19.
+            # this problem.
+            # bug #19: gp_offset, fp_offset, overflow_arg_area, reg_save_area
+            # bug #32: isa, flags, str and length were added in llvm 3.9
             to_skip = [
-                "gp_offset", "fp_offset", "overflow_arg_area", "reg_save_area"]
+                "gp_offset",
+                "fp_offset",
+                "overflow_arg_area",
+                "reg_save_area",
+                "isa",
+                "flags",
+                "str",
+                "length"
+            ]
 
         if "name" in attrs and attrs["name"] in to_skip:
             decl.location = declarations.location_t('', -1)