Clean warnings and refactor stdlib tests.

Merge RangeJVMTest into RangeTest.

libraries/stdlib/test/numbers/CompanionIntrinsicObjectsJVMTest.kt

@@ -24,6 +24,7 @@ import org.junit.Test
 class CompanionIntrinsicObjectsJVMTest {
     @Test fun intTest() {
         val i = Int
+        i.MAX_VALUE
 
         assertEquals(java.lang.Integer.MAX_VALUE, Int.MAX_VALUE)
         assertEquals(java.lang.Integer.MIN_VALUE, Int.MIN_VALUE)
@@ -31,6 +32,7 @@ class CompanionIntrinsicObjectsJVMTest {
 
     @Test fun doubleTest() {
         val d = Double
+        d.NaN
 
         assertEquals(java.lang.Double.POSITIVE_INFINITY, Double.POSITIVE_INFINITY)
         assertEquals(java.lang.Double.NEGATIVE_INFINITY, Double.NEGATIVE_INFINITY)
@@ -42,6 +44,7 @@ class CompanionIntrinsicObjectsJVMTest {
 
     @Test fun floatTest() {
         val f = Float
+        f.NEGATIVE_INFINITY
 
         assertEquals(java.lang.Float.POSITIVE_INFINITY, Float.POSITIVE_INFINITY)
         assertEquals(java.lang.Float.NEGATIVE_INFINITY, Float.NEGATIVE_INFINITY)
@@ -53,6 +56,7 @@ class CompanionIntrinsicObjectsJVMTest {
 
     @Test fun longTest() {
         val l = Long
+        l.MAX_VALUE
 
         assertEquals(java.lang.Long.MAX_VALUE, Long.MAX_VALUE)
         assertEquals(java.lang.Long.MIN_VALUE, Long.MIN_VALUE)
@@ -60,6 +64,7 @@ class CompanionIntrinsicObjectsJVMTest {
 
     @Test fun shortTest() {
         val s = Short
+        s.MIN_VALUE
 
         assertEquals(java.lang.Short.MAX_VALUE, Short.MAX_VALUE)
         assertEquals(java.lang.Short.MIN_VALUE, Short.MIN_VALUE)
@@ -67,6 +72,7 @@ class CompanionIntrinsicObjectsJVMTest {
 
     @Test fun byteTest() {
         val b = Byte
+        b.MAX_VALUE
 
         assertEquals(java.lang.Byte.MAX_VALUE, Byte.MAX_VALUE)
         assertEquals(java.lang.Byte.MIN_VALUE, Byte.MIN_VALUE)
@@ -74,12 +80,14 @@ class CompanionIntrinsicObjectsJVMTest {
 
     @Test fun charTest() {
         val ch = Char
+        ch.MIN_SURROGATE
 
         assertEquals(ch, Char)
     }
 
     @Test fun stringTest() {
         val s = String
+        s.CASE_INSENSITIVE_ORDER
 
         assertEquals(s, String)
     }