[FIR] Change fir builder to use newly created nodes

compiler/fir/raw-fir/fir-common/src/org/jetbrains/kotlin/fir/builder/BaseFirBuilder.kt

@@ -530,19 +530,17 @@ abstract class BaseFirBuilder<T>(val baseSession: FirSession, val context: Conte
         }
 
         if (operation in FirOperation.ASSIGNMENTS && operation != FirOperation.ASSIGN) {
-            return buildOperatorCall {
+            return buildAssignmentOperatorStatement {
                 source = baseSource
                 this.operation = operation
                 // TODO: take good psi
-                argumentList = buildBinaryArgumentList(
-                    this@generateAssignment?.convert() ?: buildErrorExpression {
-                        source = null
-                        diagnostic = ConeSimpleDiagnostic(
-                            "Unsupported left value of assignment: ${baseSource?.psi?.text}", DiagnosticKind.ExpressionRequired
-                        )
-                    },
-                    value
-                )
+                leftArgument = this@generateAssignment?.convert() ?: buildErrorExpression {
+                    source = null
+                    diagnostic = ConeSimpleDiagnostic(
+                        "Unsupported left value of assignment: ${baseSource?.psi?.text}", DiagnosticKind.ExpressionRequired
+                    )
+                }
+                rightArgument = value
             }
         }
         require(operation == FirOperation.ASSIGN)

compiler/fir/raw-fir/light-tree2fir/src/org/jetbrains/kotlin/fir/lightTree/converter/ExpressionsConverter.kt

@@ -270,7 +270,7 @@ class ExpressionsConverter(
             if (firOperation in FirOperation.ASSIGNMENTS) {
                 return leftArgNode.generateAssignment(binaryExpression.toFirSourceElement(), rightArg, rightArgAsFir, firOperation) { getAsFirExpression(this) }
             } else {
-                buildOperatorCall {
+                buildEqualityOperatorCall {
                     source = binaryExpression.toFirSourceElement()
                     operation = firOperation
                     argumentList = buildBinaryArgumentList(leftArgAsFir, rightArgAsFir)
@@ -704,7 +704,7 @@ class ExpressionsConverter(
             }
         }
         return if (whenRefWithSubject != null) {
-            buildOperatorCall {
+            buildEqualityOperatorCall {
                 source = whenCondition.toFirSourceElement()
                 operation = FirOperation.EQ
                 argumentList = buildBinaryArgumentList(

compiler/fir/raw-fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/PsiConversionUtils.kt

@@ -32,7 +32,7 @@ internal fun KtWhenCondition.toFirWhenCondition(
     }
     return when (this) {
         is KtWhenConditionWithExpression -> {
-            buildOperatorCall {
+            buildEqualityOperatorCall {
                 source = expression?.toFirPsiSourceElement(FirFakeSourceElementKind.WhenCondition)
                 operation = FirOperation.EQ
                 argumentList = buildBinaryArgumentList(

compiler/fir/raw-fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/RawFirBuilder.kt

@@ -1632,7 +1632,7 @@ class RawFirBuilder(
                         (this as KtExpression).toFirExpression("Incorrect expression in assignment: ${expression.text}")
                     }
                 } else {
-                    buildOperatorCall {
+                    buildEqualityOperatorCall {
                         this.source = source
                         operation = firOperation
                         argumentList = buildBinaryArgumentList(leftArgument, rightArgument)