IR: remove dependency of IrTypeSubstitutor on IrBuiltIns

It was only used in one place incorrectly anyway.

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/actualizer/IrExpectActualMatchingContext.kt

@@ -247,7 +247,7 @@ internal abstract class IrExpectActualMatchingContext(
         val expectParameters = expectTypeParameters.castAll<IrTypeParameterSymbol>()
         val actualParameters = actualTypeParameters.castAll<IrTypeParameterSymbol>()
         val actualTypes = actualParameters.map { it.owner.defaultType }
-        val substitutor = IrTypeSubstitutor(expectParameters, actualTypes, typeContext.irBuiltIns, allowEmptySubstitution = true)
+        val substitutor = IrTypeSubstitutor(expectParameters, actualTypes, allowEmptySubstitution = true)
         return when (parentSubstitutor) {
             null -> substitutor
             is AbstractIrTypeSubstitutor -> IrChainedSubstitutor(parentSubstitutor, substitutor)

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/WrapInlineDeclarationsWithReifiedTypeParametersLowering.kt

@@ -50,15 +50,10 @@ class WrapInlineDeclarationsWithReifiedTypeParametersLowering(val context: Backe
                 if (!owner.isInlineFunWithReifiedParameter()) {
                     return expression
                 }
-                val substitutionMap = expression.typeSubstitutionMap
-                    .entries
-                    .map { (key, value) ->
-                        key to (value as IrTypeArgument)
-                    }
+                val substitutionMap = expression.typeSubstitutionMap.entries
                 val typeSubstitutor = IrTypeSubstitutor(
-                    substitutionMap.map { it.first },
-                    substitutionMap.map { it.second },
-                    context.irBuiltIns
+                    substitutionMap.map { it.key },
+                    substitutionMap.map { it.value as IrTypeArgument },
                 )
 
                 val function = irFactory.buildFun {