Support for Swift language and Clang modules for ninja generator.

test/ios/swift/MyObjcClass.m

+#import "MyObjcClass.h"
+
+@import swift_framework;
+
+@interface MyObjcClass ()
+@property(nonatomic, strong) MySwiftFrameworkClass* f;
+@property(nonatomic, strong) MyObjcFrameworkClass* o;
+@end
+
+@implementation MyObjcClass
+
+- (instancetype)init {
+  self = [super init];
+  if (self) {
+    self.f = [[MySwiftFrameworkClass alloc] init];
+    self.o = [[MyObjcFrameworkClass alloc] init];
+  }
+  return self;
+}
+
+@end