fix: shorten function names like cpp::namespace::Class::method()::::operator() (#494)

internal/graph/graph.go

 var (
 	javaRegExp = regexp.MustCompile(`^(?:[a-z]\w*\.)*([A-Z][\w\$]*\.(?:<init>|[a-z][\w\$]*(?:\$\d+)?))(?:(?:\()|$)`)
 	goRegExp   = regexp.MustCompile(`^(?:[\w\-\.]+\/)+(.+)`)
-	cppRegExp  = regexp.MustCompile(`^(?:(?:\(anonymous namespace\)::)(\w+$))|(?:(?:\(anonymous namespace\)::)?(?:[_a-zA-Z]\w*\::|)*(_*[A-Z]\w*::~?[_a-zA-Z]\w*)$)`)
+	cppRegExp  = regexp.MustCompile(`^(?:(?:\(anonymous namespace\)::)(\w+$))|(?:(?:\(anonymous namespace\)::)?(?:[_a-zA-Z]\w*\::|)*(_*[A-Z]\w*::~?[_a-zA-Z]\w*))`)
 )
 
 // Graph summarizes a performance profile into a format that is

internal/graph/graph_test.go

 			"(anonymous namespace)::foo",
 			"foo",
 		},
+		{
+			"cpp::namespace::Class::method()::$_100::operator()",
+			"Class::method",
+		},
 		{
 			"foo_bar::Foo::bar",
 			"Foo::bar",