re PR other/46332 (__cxa_demangle yields excess parentheses for function types)

re PR other/46332 (__cxa_demangle yields excess parentheses for function types)

libiberty/:
	PR other/46332
	* cp-demangle.c (d_print_function_type): Don't print parentheses
	if there are no modifiers to print.
	* testsuite/demangle-expected: Tweak one test case, add another.
libstdc++/:
	* testsuite/abi/demangle/abi_examples/14.cc (main): Change
	expected demangling.

From-SVN: r166695