PR libstdc++/86112 fix printers for Python 2.6

Dict comprehensions are only supported since Python 2.7, so use an
alternative syntax that is backwards compatible.

	PR libstdc++/86112
	* python/libstdcxx/v6/printers.py (add_one_template_type_printer):
	Replace dict comprehension.

From-SVN: r262115

libstdc++-v3/ChangeLog

 2018-06-25  Jonathan Wakely  <jwakely@redhat.com>
 
+	PR libstdc++/86112
+	* python/libstdcxx/v6/printers.py (add_one_template_type_printer):
+	Replace dict comprehension.
+
 	PR libstdc++/81092
 	* config/abi/post/powerpc64-linux-gnu/baseline_symbols.txt: Update.
 

libstdc++-v3/python/libstdcxx/v6/printers.py

@@ -1438,7 +1438,8 @@ def add_one_template_type_printer(obj, name, defargs):
     if _versioned_namespace:
         # Add second type printer for same type in versioned namespace:
         ns = 'std::' + _versioned_namespace
-        defargs = { n: d.replace('std::', ns) for n,d in defargs.items() }
+        # PR 86112 Cannot use dict comprehension here:
+        defargs = dict((n, d.replace('std::', ns)) for (n,d) in defargs.items())
         printer = TemplateTypePrinter(ns+name, defargs)
         gdb.types.register_type_printer(obj, printer)