Fix floating point conversions to match Kotlin/JVM

(cherry picked from commit de078d6)

backend.native/tests/build.gradle

@@ -1449,6 +1449,27 @@ task hash0(type: RunKonanTest) {
     source = "runtime/basic/hash0.kt"
 }
 
+task ieee754(type: RunKonanTest) {
+    goldValue = "Infinity 2147483647 -1 -1\n" +
+            "3.4028235E38\n" +
+            "NAN2SHORT:: 0\n" +
+            "MAX2SHORT:: -1\n" +
+            "2147483647 -1\n" +
+            "FLOAT:: Infinity   INT:: 2147483647\n" +
+            "FLOAT:: 1.7014117E38   INT:: 2147483647\n" +
+            "FLOAT:: 3.4028235E38   INT:: 2147483647\n" +
+            "FLOAT:: 3.14   INT:: 3\n" +
+            "FLOAT:: NaN   INT:: 0\n" +
+            "FLOAT:: -33333.125   INT:: -33333\n" +
+            "FLOAT:: 1.4E-45   INT:: 0\n" +
+            "FLOAT:: -Infinity   INT:: -2147483648\n" +
+            "FLOAT:: -1.2   INT:: -1\n" +
+            "FLOAT:: -12.6   INT:: -12\n" +
+            "FLOAT:: 2.3   INT:: 2\n" +
+            "OK\n"
+    source = "runtime/basic/ieee754.kt"
+}
+
 task array_list1(type: RunKonanTest) {
     goldValue = "OK\n"
     source = "runtime/collections/array_list1.kt"

backend.native/tests/runtime/basic/ieee754.kt

@@ -0,0 +1,29 @@
+package runtime.basic.ieee754
+
+import kotlin.test.*
+
+@Test fun runTest() {
+    val v = Float.POSITIVE_INFINITY
+    val i = v.toInt()
+    println("$v $i ${v.toShort()} ${i.toShort()}")
+
+    val a = 42
+    val b = Float.MAX_VALUE
+    println("${a + b}")
+
+    val s = Float.NaN.toShort()
+    println("NAN2SHORT:: $s")
+
+    val d: Float = Float.MAX_VALUE
+    println("MAX2SHORT:: ${d.toShort()}")
+    val d2i = d.toInt()
+    println("$d2i ${d2i.toShort()}")
+
+    for (f in arrayOf(Float.POSITIVE_INFINITY, Float.MAX_VALUE / 2, Float.MAX_VALUE,
+            3.14f, Float.NaN, -33333.12312f, Float.MIN_VALUE, Float.NEGATIVE_INFINITY,
+            -1.2f, -12.6f, 2.3f)) {
+        println("FLOAT:: $f   INT:: ${f.toInt()}")
+    }
+
+    println("OK")
+}