[IR] Drop all usages of Ir.irModule

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

@@ -164,7 +164,7 @@ internal class Context(
     override lateinit var ir: KonanIr
 
     override val irBuiltIns
-        get() = ir.irModule.irBuiltins
+        get() = irModule!!.irBuiltins
 
     override val typeSystem: IrTypeSystemContext
         get() = IrTypeSystemContextImpl(irBuiltIns)

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

@@ -25,7 +25,7 @@ import org.jetbrains.kotlin.util.OperatorNameConventions
 internal val createLLVMDeclarationsPhase = makeKonanModuleOpPhase(
         name = "CreateLLVMDeclarations",
         description = "Map IR declarations to LLVM",
-        op = { context, _ -> context.generationState.llvmDeclarations = createLlvmDeclarations(context.generationState, context.ir.irModule) }
+        op = { context, _ -> context.generationState.llvmDeclarations = createLlvmDeclarations(context.generationState, context.irModule!!) }
 )
 
 internal val RTTIPhase = makeKonanModuleOpPhase(