Property initializers from primary constructor parameters

are generated as property initializer expressions
and should not be repeated in primary constructor.

compiler/testData/ir/irText/classes/initBlock.txt

@@ -11,9 +11,6 @@ FILE /initBlock.kt
     CONSTRUCTOR public constructor Test2(x: kotlin.Int)
       BLOCK_BODY
         DELEGATING_CONSTRUCTOR_CALL 'constructor Any()'
-        SET_BACKING_FIELD 'x: Int' type=kotlin.Unit operator=null
-          receiver: THIS of 'Test2' type=Test2
-          value: GET_VAR 'value-parameter x: Int' type=kotlin.Int operator=INITIALIZE_PROPERTY_FROM_PARAMETER
         INSTANCE_INITIALIZER_CALL classDescriptor='Test2'
     PROPERTY public final val x: kotlin.Int
       EXPRESSION_BODY