Fix #2371

Mangle parameter names clashing with C keywords when producing framework

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/CAdapterGenerator.kt

@@ -57,7 +57,7 @@ private operator fun String.times(count: Int): String {
     return builder.toString()
 }
 
-private val cKeywords = setOf(
+internal val cKeywords = setOf(
         // Actual C keywords.
         "auto", "break", "case",
         "char", "const", "continue",

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/objcexport/ObjCExportHeaderGenerator.kt

@@ -652,7 +652,7 @@ abstract class ObjCExportHeaderGenerator(
         fun collectParameters(baseMethodBridge: MethodBridge, method: FunctionDescriptor): List<ObjCParameter> {
             fun unifyName(initialName: String, usedNames: Set<String>): String {
                 var unique = initialName
-                while (unique in usedNames) {
+                while (unique in usedNames || unique in cKeywords) {
                     unique += "_"
                 }
                 return unique

backend.native/tests/framework/values/values.kt

@@ -240,3 +240,5 @@ fun IC3?.getValueOrNull3() = this?.value
 
 fun isFrozen(obj: Any): Boolean = obj.isFrozen
 fun kotlinLambda(block: (Any) -> Any): Any = block
+
+fun multiply(int: Int, long: Long) = int * long

backend.native/tests/framework/values/values.swift

@@ -271,6 +271,8 @@ func testFunctions() throws {
 
     try assertEquals(actual: ValuesKt.argsFun(i: 10, l: 20, d: 3.5, s: "res") as! String,
             expected: "res10203.5")
+
+    try assertEquals(actual: ValuesKt.multiply(int: 3, long: 2), expected: 6)
 }
 
 func testFuncType() throws {