s390x: Enable most memory64 tests

* Support full set of ADD LOGICAL / SUBTRACT LOGICAL instructions

* Full implementation of IaddIfcout lowering

* Enable most memory64 tests (except simd and threads)

build.rs

@@ -184,8 +184,9 @@ fn ignore(testsuite: &str, testname: &str, strategy: &str) -> bool {
         "Cranelift" => match (testsuite, testname) {
             // No simd support yet for s390x.
             ("simd", _) if platform_is_s390x() => return true,
-            // No memory64 support yet for s390x.
-            ("memory64", _) if platform_is_s390x() => return true,
+            ("memory64", "simd") if platform_is_s390x() => return true,
+            // No full atomics support yet for s390x.
+            ("memory64", "threads") if platform_is_s390x() => return true,
             _ => {}
         },
         _ => panic!("unrecognized strategy"),