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/jvmAssertInlineFunctionAssertionsDisabled.kt

@@ -5,6 +5,8 @@
 // IGNORE_BACKEND: JVM_IR
 // TARGET_BACKEND: JVM
 
+package test
+
 inline fun inlineMe() {
     assert(false) { "FROM INLINED" }
 }
@@ -12,6 +14,8 @@ inline fun inlineMe() {
 // FILE: inlineSite.kt
 // KOTLIN_CONFIGURATION_FLAGS: ASSERTIONS_MODE=jvm
 
+import test.*
+
 class CheckerJvmAssertInlineFunctionAssertionsDisabled {
     fun check() {
         inlineMe()