IR: properly compute IrProperty.resolveFakeOverride()

Now that IrProperty has its own overriddenSymbols, we can generalize the
search for fake overrides. Also works for fake override properties
derived from Java fields.

compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/overrides/FakeOverrides.kt

@@ -159,7 +159,6 @@ class FakeOverrideBuilder(
 
     private fun provideFakeOverrides(klass: IrClass) {
         buildFakeOverrideChainsForClass(klass)
-        propertyOverriddenSymbols.clear()
         irOverridingUtil.clear()
         haveFakeOverrides.add(klass)
     }