Move Kotlin version to 1.1.4, fix some warnings. (#802)

backend.native/cli.bc/src/org/jetbrains/kotlin/cli/bc/K2Native.kt

@@ -39,6 +39,7 @@ import kotlin.reflect.KFunction
 private fun maybeExecuteHelper(targetName: String) {
     try {
         val kClass = Class.forName("org.jetbrains.kotlin.konan.Helper0").kotlin
+        @Suppress("UNCHECKED_CAST")
         val ctor = kClass.constructors.single() as KFunction<Runnable>
         val distribution = Distribution(TargetManager(targetName))
         val result = ctor.call(

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

@@ -127,7 +127,7 @@ internal fun produceOutput(context: Context) {
                 llvmModule,
                 nopack,
                 manifest,
-                context.moduleEscapeAnalysisResult?.build()?.toByteArray())
+                context.moduleEscapeAnalysisResult.build().toByteArray())
 
             context.library = library
             context.bitcodeFileName = library.mainBitcodeFileName

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

@@ -150,7 +150,7 @@ internal fun structType(types: List<LLVMTypeRef>): LLVMTypeRef =
 
 internal fun ContextUtils.numParameters(functionType: LLVMTypeRef) : Int {
     // Note that type is usually function pointer, so we have to dereference it.
-    return LLVMCountParamTypes(LLVMGetElementType(functionType))!!
+    return LLVMCountParamTypes(LLVMGetElementType(functionType))
 }
 
 internal fun ContextUtils.isObjectReturn(functionType: LLVMTypeRef) : Boolean {