Move JVM8 box test to common

compiler/testData/codegen/box/optimizations/hashCode.kt

@@ -0,0 +1,16 @@
+// TARGET_BACKEND: JVM
+// JVM_TARGET: 1.8
+
+fun box(): String {
+    true.hashCode()
+    1.toByte().hashCode()
+    1.toChar().hashCode()
+    1.toShort().hashCode()
+    1.hashCode()
+    1L.hashCode()
+    1.0F.hashCode()
+    1.0.hashCode()
+    "".hashCode()
+
+    return "OK"
+}