KT-14258 Optimize accesses to properties defined into companion

- Use direct access to property defined into companion object when
it is possible rather than always use an accessor to access the
property.
- Use direct access will speedup runtime performance.
- Avoid to generate useless accessors for companion properties.

Fix of https://youtrack.jetbrains.com/issue/KT-14258

compiler/testData/codegen/bytecodeText/companion/kt14258_3.kt

@@ -0,0 +1,28 @@
+// Checks that accessor methods are always used due to the overriding of the default setter of 'my' property.
+
+class My {
+    companion object {
+        private var my: String = "OK"
+            set(value) { field = value }
+    }
+
+    fun getMyValue(): String {
+        // INVOKESTATIC My$Companion.access$setMy$p
+        my = "Overriden value"
+        // GETSTATIC My.my
+        return my
+    }
+
+    // PUTSTATIC My.my into clinit
+    // PUTSTATIC My.my into 'access$setMy$cp'
+    // GETSTATIC My.my into 'access$getMy$cp'
+}
+
+// 2 GETSTATIC My.my
+// 2 PUTSTATIC My.my
+// 0 INVOKESTATIC My\$Companion.access\$getMy\$p
+// 1 INVOKESTATIC My\$Companion.access\$setMy\$p
+// 1 INVOKESTATIC My.access\$setMy\$cp
+// 1 INVOKESTATIC My.access\$getMy\$cp
+// 1 INVOKESPECIAL My\$Companion.getMy
+// 1 INVOKESPECIAL My\$Companion.setMy