8154122: Intrinsify fused mac operations

Added FMA intrinsics on x86

Reviewed-by: kvn, aph, darcy

jdk/src/java.base/share/classes/java/lang/Math.java

@@ -1626,7 +1626,7 @@ public final class Math {
      *
      * @since 9
      */
-    // @HotSpotIntrinsicCandidate
+    @HotSpotIntrinsicCandidate
     public static double fma(double a, double b, double c) {
         /*
          * Infinity and NaN arithmetic is not quite the same with two
@@ -1743,7 +1743,7 @@ public final class Math {
      *
      * @since 9
      */
-    // @HotSpotIntrinsicCandidate
+    @HotSpotIntrinsicCandidate
     public static float fma(float a, float b, float c) {
         /*
          *  Since the double format has more than twice the precision

jdk/test/java/lang/Math/FusedMultiplyAddTests.java

@@ -221,6 +221,9 @@ public class FusedMultiplyAddTests {
 
             {Double.MIN_VALUE, -0.0, +0.0,
              +0.0},
+
+            {1.0+Math.ulp(1.0), 1.0+Math.ulp(1.0), -1.0-2.0*Math.ulp(1.0),
+             Math.ulp(1.0)*Math.ulp(1.0)},
         };
 
         for (double[] testCase: testCases)
@@ -344,6 +347,9 @@ public class FusedMultiplyAddTests {
 
             {Float.MAX_VALUE, 2.0f, 1.0f,
              InfinityF},
+
+            {1.0f+Math.ulp(1.0f), 1.0f+Math.ulp(1.0f), -1.0f-2.0f*Math.ulp(1.0f),
+             Math.ulp(1.0f)*Math.ulp(1.0f)},
         };
 
         for (float[] testCase: testCases)