Fix header map nextPowerOf2 method.

test/ios/framework/iOSFramework/Thing.m

Index: test/ios/framework/iOSFramework/Thing.m
diff --git a/test/ios/framework/iOSFramework/Thing.m b/test/ios/framework/iOSFramework/Thing.m
new file mode 100644
index 0000000000000000000000000000000000000000..5b2b54925e324637f5269a6296f7bedb5d596a5c
--- /dev/null
+++ b/test/ios/framework/iOSFramework/Thing.m
@@ -0,0 +1,22 @@
+#import "Thing.h"
+
+@interface Thing ()
+
+@end
+
+@implementation Thing
+
++ (instancetype)thing {
+  static Thing* thing = nil;
+  static dispatch_once_t onceToken;
+  dispatch_once(&onceToken, ^{
+      thing = [[[self class] alloc] init];
+  });
+  return thing;
+}
+
+- (void)sayHello {
+  NSLog(@"Hello World");
+}
+
+@end