KT-36810 Implement javaPrimitiveType intrinsic in JVM_IR

compiler/testData/codegen/box/inlineClasses/javaPrimitiveTypeIC.kt

@@ -0,0 +1,34 @@
+// IGNORE_BACKEND_FIR: JVM_IR
+// TARGET_BACKEND: JVM
+// WITH_RUNTIME
+import kotlin.test.*
+
+inline class I(val x: Int)
+inline class JLI(val x: java.lang.Integer)
+inline class U(val x: Unit?)
+inline class N(val x: Nothing?)
+
+val icUnit = U(Unit)
+val icNull = N(null)
+
+val anyIcUnit: Any = icUnit
+val anyIcNull: Any = icNull
+
+val z = I(42)
+val jli = JLI(java.lang.Integer(42))
+
+fun box(): String {
+    assertEquals(null, icUnit::class.javaPrimitiveType)
+    assertEquals(null, icNull::class.javaPrimitiveType)
+    assertEquals(null, anyIcUnit::class.javaPrimitiveType)
+    assertEquals(null, anyIcNull::class.javaPrimitiveType)
+    assertEquals(null, z::class.javaPrimitiveType)
+    assertEquals(null, jli::class.javaPrimitiveType)
+
+    assertEquals(null, U::class.javaPrimitiveType)
+    assertEquals(null, N::class.javaPrimitiveType)
+    assertEquals(null, I::class.javaPrimitiveType)
+    assertEquals(null, JLI::class.javaPrimitiveType)
+
+    return "OK"
+}

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"
+}