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/cli/jvm/syntheticAccessorForPropertiesSignatureClash.kt

@@ -16,7 +16,9 @@ class A {
     fun `access$getBar$lp`(a: A): Int = 7
 
     companion object {
-        private var foo = 1;
+        private var foo = 1
+            // Custom getter is needed, otherwise no need to generate getY and setY
+            get() = field
 
         fun test() {
             {