[FIR] Resolve rhs of += in dependent context

compiler/testData/codegen/box/javaInterop/genericSamProjectedOutWithNewInference.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // TARGET_BACKEND: JVM
 // IGNORE_BACKEND: JVM_IR
 

compiler/testData/codegen/box/regressions/lambdaPostponeConstruction.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 class MyList<T>
 
 operator fun <T> MyList<T>.plusAssign(element: T) {}

compiler/testData/diagnostics/tests/inference/genericAssignmentOperator.fir.kt

@@ -5,5 +5,5 @@ fun <T> f(): R<T> = R<T>()
 operator fun Int.plusAssign(y: R<Int>) {}
 
 fun box() {
-    <!INAPPLICABLE_CANDIDATE!>1 += f()<!>
+    1 += f()
 }

compiler/testData/diagnostics/tests/operatorsOverloading/kt1028.fir.kt

@@ -29,7 +29,7 @@ class Test()
     fun test()
     {
         val control = Control()
-        control.MouseMoved += { <!UNRESOLVED_REFERENCE!>it<!>.<!UNRESOLVED_REFERENCE!>X<!> } // here
+        control.MouseMoved += { it.X } // here
         control.MouseMoved.plusAssign( { it.X } ) // ok
     }
 }

compiler/testData/diagnostics/testsWithStdLib/coroutines/inference/plusAssignWithLambda.fir.kt

@@ -37,6 +37,6 @@ class B {
 }
 
 fun foo3(x: B) = {
-    <!VARIABLE_EXPECTED!>x<!> += { "" }
-    <!VARIABLE_EXPECTED!>x<!> += id { "" }
+    x += { "" }
+    x += id { "" }
 }

compiler/testData/diagnostics/testsWithStdLib/coroutines/inference/plusAssignWithLambda2.fir.kt

@@ -13,8 +13,8 @@ fun <T> id(x: T) = x
 
 fun main() {
     var newValue = A()
-    <!INAPPLICABLE_CANDIDATE!>newValue += id { total -> A() }<!>
-    <!INAPPLICABLE_CANDIDATE!>newValue += id(fun(total) = A())<!>
-    <!INAPPLICABLE_CANDIDATE!>newValue += id(fun(total): A { return A() })<!>
+    <!ASSIGN_OPERATOR_AMBIGUITY!>newValue += id { total -> A() }<!>
+    <!ASSIGN_OPERATOR_AMBIGUITY!>newValue += id(fun(total) = A())<!>
+    <!ASSIGN_OPERATOR_AMBIGUITY!>newValue += id(fun(total): A { return A() })<!>
     <!ASSIGN_OPERATOR_AMBIGUITY!>newValue += id(::foo)<!>
 }