Refine naming: *TypeVariable -> *TypeParameter

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/components/SimpleArgumentsChecks.kt

@@ -96,7 +96,7 @@ private fun checkExpressionArgument(
     val position = if (isReceiver) ReceiverConstraintPositionImpl(expressionArgument) else ArgumentConstraintPositionImpl(expressionArgument)
 
     // Used only for arguments with @NotNull annotation
-    if (expectedType is NotNullTypeVariable && argumentType.isMarkedNullable) {
+    if (expectedType is NotNullTypeParameter && argumentType.isMarkedNullable) {
         diagnosticsHolder.addDiagnostic(ArgumentNullabilityMismatchDiagnostic(expectedType, argumentType, expressionArgument))
     }
 

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/inference/components/NewTypeSubstitutor.kt

@@ -156,7 +156,7 @@ interface NewTypeSubstitutor : TypeSubstitutorMarker {
         if (type.isDefinitelyNotNullType) {
             replacement = replacement.makeDefinitelyNotNullOrNotNull()
         }
-        if (type is CustomTypeVariable) {
+        if (type is CustomTypeParameter) {
             replacement = type.substitutionResult(replacement).unwrap()
         }