Put $assertionDisabled field into inline-site's class

The generated code is more inline with java, and we avoid the error of
accessing package-private field outside of the package.
However, this changes semantics a bit. Now, a user should set assertion
status of inline-site's package, instead of inline function's one.
 #KT-28317: Fixed

compiler/testData/codegen/boxInline/assert/jvmDoubleInline.kt

@@ -0,0 +1,48 @@
+// TARGET_BACKEND: JVM
+// FILE: inline.kt
+// KOTLIN_CONFIGURATION_FLAGS: ASSERTIONS_MODE=jvm
+// WITH_RUNTIME
+// FULL_JDK
+package test
+
+class A {
+    inline fun a() {
+        assert(false) { "from inlined" }
+    }
+}
+
+class B {
+    inline fun b() {
+        A().a()
+        error("FAIL 0")
+    }
+}
+
+// FILE: inlineSite.kt
+// KOTLIN_CONFIGURATION_FLAGS: ASSERTIONS_MODE=jvm
+import test.*
+
+class Checker {
+    fun check() {
+        B().b()
+        error("FAIL 1")
+    }
+}
+
+class Dummy
+
+fun enableAssertions(): Checker {
+    val loader = Dummy::class.java.classLoader
+    loader.setDefaultAssertionStatus(true)
+    val c = loader.loadClass("Checker")
+    return c.newInstance() as Checker
+}
+
+fun box(): String {
+    var c = enableAssertions()
+    try {
+        c.check()
+        return "FAIL 2"
+    } catch (ignore: AssertionError) {}
+    return "OK"
+}