KT-36810 Implement javaPrimitiveType intrinsic in JVM_IR

compiler/testData/codegen/box/intrinsics/javaPrimitiveType_UnitAndNothing.kt

@@ -0,0 +1,17 @@
+// IGNORE_BACKEND_FIR: JVM_IR
+// TARGET_BACKEND: JVM
+// WITH_RUNTIME
+import kotlin.test.*
+
+val pUnit = Unit
+val pNUnit: Unit? = Unit
+
+fun box(): String {
+    assertEquals(null, pUnit::class.javaPrimitiveType)
+    assertEquals(null, pNUnit!!::class.javaPrimitiveType)
+
+    assertEquals(null, Unit::class.javaPrimitiveType)
+    assertEquals(java.lang.Void.TYPE, Nothing::class.javaPrimitiveType)
+
+    return "OK"
+}