Add aarch64 instructions wherever possible

fma, sqrt and various rounding functions have aarch64 instruction equivalent

Change-Id: I1284f31b9f78f914281e5563b8d44db8362b627d

libm/arm64/rint.S

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2015, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <private/bionic_asm.h>
+
+ENTRY(rint)
+  frintX d0, d0
+  ret
+END(rint)
+
+ENTRY(rintf)
+  frintX s0, s0
+  ret
+END(rintf)