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/staticFields/classObjectSyntheticAccessor.kt

@@ -1,8 +0,0 @@
-class A {
-    companion object {
-        private var r: Int = 1;
-    }
-}
-// A and companion object constructor call
-// 3 ALOAD 0
-// 1 synthetic access\$getR