Split common builtin companion tests from JVM-only tests

Remove duplicated tests from NumbersJVMTest.

libraries/stdlib/test/numbers/BuiltinCompanionTest.kt

@@ -0,0 +1,74 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package test.numbers
+
+import kotlin.test.*
+
+class BuiltinCompanionTest {
+
+    @Test
+    fun intTest() {
+        val i = Int
+        i.MAX_VALUE
+
+        assertSame(Int, i)
+    }
+
+    @Test
+    fun doubleTest() {
+        val d = Double
+        d.NaN
+
+        assertSame(Double, d)
+    }
+
+    @Test
+    fun floatTest() {
+        val f = Float
+        f.NEGATIVE_INFINITY
+
+        assertSame(Float, f)
+    }
+
+    @Test
+    fun longTest() {
+        val l = Long
+        l.MAX_VALUE
+
+        assertSame(Long, l)
+    }
+
+    @Test
+    fun shortTest() {
+        val s = Short
+        s.MIN_VALUE
+
+        assertSame(Short, s)
+    }
+
+    @Test
+    fun byteTest() {
+        val b = Byte
+        b.MAX_VALUE
+
+        assertSame(Byte, b)
+    }
+
+    @Test
+    fun charTest() {
+        val ch = Char
+        ch.MIN_SURROGATE
+
+        assertSame(Char, ch)
+    }
+
+    @Test
+    fun stringTest() {
+        val s = String
+
+        assertSame(String, s)
+    }
+}