[FIR] Let prefix inc/dec call getter twice for compatibility with K1

#KT-57179 Fixed

compiler/testData/diagnostics/tests/IncDec.fir.kt

@@ -1,46 +0,0 @@
-class IncDec() {
-  operator fun inc() : IncDec = this
-  operator fun dec() : IncDec = this
-}
-
-fun testIncDec() {
-  var x = IncDec()
-  x++
-  ++x
-  x--
-  --x
-  x = x++
-  x = x--
-  x = ++x
-  x = --x
-}
-
-class WrongIncDec() {
-  <!INAPPLICABLE_OPERATOR_MODIFIER!>operator<!> fun inc() : Int = 1
-  <!INAPPLICABLE_OPERATOR_MODIFIER!>operator<!> fun dec() : Int = 1
-}
-
-fun testWrongIncDec() {
-  var x = WrongIncDec()
-  x<!RESULT_TYPE_MISMATCH!>++<!>
-  <!RESULT_TYPE_MISMATCH!>++x<!>
-  x<!RESULT_TYPE_MISMATCH!>--<!>
-  <!RESULT_TYPE_MISMATCH!>--x<!>
-}
-
-class UnitIncDec() {
-  <!INAPPLICABLE_OPERATOR_MODIFIER!>operator<!> fun inc() : Unit {}
-  <!INAPPLICABLE_OPERATOR_MODIFIER!>operator<!> fun dec() : Unit {}
-}
-
-fun testUnitIncDec() {
-  var x = UnitIncDec()
-  x<!INC_DEC_SHOULD_NOT_RETURN_UNIT!>++<!>
-  <!INC_DEC_SHOULD_NOT_RETURN_UNIT!>++<!>x
-  x<!INC_DEC_SHOULD_NOT_RETURN_UNIT!>--<!>
-  <!INC_DEC_SHOULD_NOT_RETURN_UNIT!>--<!>x
-  x = x<!INC_DEC_SHOULD_NOT_RETURN_UNIT!>++<!>
-  x = x<!INC_DEC_SHOULD_NOT_RETURN_UNIT!>--<!>
-  x = <!INC_DEC_SHOULD_NOT_RETURN_UNIT, INC_DEC_SHOULD_NOT_RETURN_UNIT!>++<!>x
-  x = <!INC_DEC_SHOULD_NOT_RETURN_UNIT, INC_DEC_SHOULD_NOT_RETURN_UNIT!>--<!>x
-}

compiler/testData/diagnostics/tests/IncDec.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 class IncDec() {
   operator fun inc() : IncDec = this
   operator fun dec() : IncDec = this

compiler/testData/diagnostics/tests/operatorsOverloading/InconsistentGetSet.fir.kt

@@ -18,7 +18,7 @@ object MismatchingTypes {
 }
 
 fun testMismatchingTypes() {
-    ++<!ARGUMENT_TYPE_MISMATCH!>MismatchingTypes[0]<!>
+    <!ARGUMENT_TYPE_MISMATCH!>++MismatchingTypes[0]<!>
     <!ARGUMENT_TYPE_MISMATCH!>MismatchingTypes[0]++<!>
     MismatchingTypes[0] <!UNRESOLVED_REFERENCE!>+=<!> 1
 }

compiler/testData/diagnostics/tests/prefixIncReturnType.fir.kt

@@ -0,0 +1,15 @@
+// Breaking change in K2, see KT-57178
+
+open class I {
+    operator fun inc(): ST = ST()
+}
+
+class ST : I()
+
+var topLevel: I
+    get() = I()
+    set(value) {}
+
+fun main() {
+    val x: ST = <!INITIALIZER_TYPE_MISMATCH!>++topLevel<!>
+}

compiler/testData/diagnostics/tests/prefixIncReturnType.kt

@@ -0,0 +1,15 @@
+// Breaking change in K2, see KT-57178
+
+open class I {
+    operator fun inc(): ST = ST()
+}
+
+class ST : I()
+
+var topLevel: I
+    get() = I()
+    set(value) {}
+
+fun main() {
+    val x: ST = ++topLevel
+}

compiler/testData/diagnostics/tests/prefixIncSmartCast.fir.kt

@@ -0,0 +1,13 @@
+// Changed in K2, see KT-57178
+
+open class I {
+    operator fun inc(): ST = ST()
+}
+
+class ST : I()
+
+fun main() {
+    var local = I()
+    val x: ST = ++local
+    val y: ST = local
+}

compiler/testData/diagnostics/tests/prefixIncSmartCast.kt

@@ -0,0 +1,13 @@
+// Changed in K2, see KT-57178
+
+open class I {
+    operator fun inc(): ST = ST()
+}
+
+class ST : I()
+
+fun main() {
+    var local = I()
+    val x: ST = ++local
+    val y: ST = <!TYPE_MISMATCH!>local<!>
+}