demangler: Handle <=> operator in the demangler [PR94797]

The demangler didn't handle spaceship operator.

2020-04-27  Jakub Jelinek  <jakub@redhat.com>

	PR demangler/94797
	* cp-demangle.c (cplus_demangle_operators): Add ss <=> operator.
	* testsuite/demangle-expected: Add operator<=> test.

libiberty/ChangeLog

+2020-04-27  Jakub Jelinek  <jakub@redhat.com>
+
+	PR demangler/94797
+	* cp-demangle.c (cplus_demangle_operators): Add ss <=> operator.
+	* testsuite/demangle-expected: Add operator<=> test.
+
 2020-04-25  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR bootstrap/94739

libiberty/cp-demangle.c

@@ -1860,6 +1860,7 @@ const struct demangle_operator_info cplus_demangle_operators[] =
   { "sP", NL ("sizeof..."), 1 },
   { "sZ", NL ("sizeof..."), 1 },
   { "sc", NL ("static_cast"), 2 },
+  { "ss", NL ("<=>"),       2 },
   { "st", NL ("sizeof "),   1 },
   { "sz", NL ("sizeof "),   1 },
   { "tr", NL ("throw"),     0 },

libiberty/testsuite/demangle-expected

@@ -1453,3 +1453,6 @@ void foo<(void*)0>(enable_if<((void*)0)==(decltype(nullptr)), void>::type*)
 
 _ZNK5coro15emptyawEv
 coro1::empty::operator co_await() const
+
+_ZNK3FoossERKS_
+Foo::operator<=>(Foo const&) const