KT-30780 Fix erased inline class context in class context hierarchy

In SourceCompilerForInline we could enter ERASED_INLINE_CLASS context
from containing declaration context. That broke codegen context
hierarchy invariants assumed in accessor generation.

compiler/testData/codegen/box/inlineClasses/contextsAndAccessors/kt30780.kt

@@ -0,0 +1,16 @@
+// !LANGUAGE: +InlineClasses
+// IGNORE_BACKEND: JVM_IR
+
+inline class Test(val x: Int) {
+    private companion object {
+        private const val CONSTANT = "OK"
+    }
+
+    fun crash() = getInlineConstant()
+
+    private inline fun getInlineConstant(): String {
+        return CONSTANT
+    }
+}
+
+fun box() = Test(1).crash()