Add SIZE_BITS and SIZE_BYTES constants to Double and Float

#KT-29182

libraries/stdlib/js-ir/builtins/Primitives.kt

@@ -701,6 +701,18 @@ public class Float private constructor() : Number(), Comparable<Float> {
          * A constant holding the "not a number" value of Float.
          */
         public const val NaN: Float = -(0.0F/0.0F)
+
+        /**
+         * The number of bytes used to represent an instance of Float in a binary form.
+         */
+        @SinceKotlin("1.4")
+        public const val SIZE_BYTES: Int = 4
+
+        /**
+         * The number of bits used to represent an instance of Float in a binary form.
+         */
+        @SinceKotlin("1.4")
+        public const val SIZE_BITS: Int = 32
     }
 
     /**
@@ -906,6 +918,18 @@ public class Double private constructor() : Number(), Comparable<Double> {
          * A constant holding the "not a number" value of Double.
          */
         public const val NaN: Double = -(0.0/0.0)
+
+        /**
+         * The number of bytes used to represent an instance of Double in a binary form.
+         */
+        @SinceKotlin("1.4")
+        public const val SIZE_BYTES: Int = 8
+
+        /**
+         * The number of bits used to represent an instance of Double in a binary form.
+         */
+        @SinceKotlin("1.4")
+        public const val SIZE_BITS: Int = 64
     }
 
     /**

libraries/stdlib/js/runtime/primitiveCompanionObjects.kt

@@ -21,6 +21,12 @@ internal object DoubleCompanionObject {
 
     @JsName("NaN")
     const val NaN: Double = -(0.0/0.0)
+
+    @JsName("SIZE_BYTES")
+    const val SIZE_BYTES = 8
+
+    @JsName("SIZE_BITS")
+    const val SIZE_BITS = 64
 }
 
 @JsName("FloatCompanionObject")
@@ -39,6 +45,12 @@ internal  object FloatCompanionObject {
 
     @JsName("NaN")
     const val NaN: Float = -(0.0F/0.0F)
+
+    @JsName("SIZE_BYTES")
+    const val SIZE_BYTES = 4
+
+    @JsName("SIZE_BITS")
+    const val SIZE_BITS = 32
 }
 
 @JsName("IntCompanionObject")

libraries/stdlib/jvm/runtime/kotlin/jvm/internal/PrimitiveCompanionObjects.kt

@@ -11,6 +11,8 @@ internal object DoubleCompanionObject {
     const val POSITIVE_INFINITY: Double = java.lang.Double.POSITIVE_INFINITY
     const val NEGATIVE_INFINITY: Double = java.lang.Double.NEGATIVE_INFINITY
     const val NaN: Double = java.lang.Double.NaN
+    const val SIZE_BYTES: Int = 8
+    const val SIZE_BITS: Int = SIZE_BYTES * 8
 
     // for binary compatibility with pre 1.4
     fun getMIN_VALUE(): Double = java.lang.Double.MIN_VALUE
@@ -26,6 +28,8 @@ internal object FloatCompanionObject {
     const val POSITIVE_INFINITY: Float = java.lang.Float.POSITIVE_INFINITY
     const val NEGATIVE_INFINITY: Float = java.lang.Float.NEGATIVE_INFINITY
     const val NaN: Float = java.lang.Float.NaN
+    const val SIZE_BYTES: Int = 4
+    const val SIZE_BITS: Int = SIZE_BYTES * 8
 
     // for binary compatibility with pre 1.4
     fun getMIN_VALUE(): Float = java.lang.Float.MIN_VALUE