Fix method_setImplementation bug.
Fix method_setImplementation bug.



gnustep/libobjc2,darlinghq/darling-libobjc2,gnustep/libobjc2,ngrewe/libobjc2,crystax/android-vendor-libobjc2,davidchisnall/libobjc2,darlinghq/darling-libobjc2,ngrewe/libobjc2,crystax/android-vendor-libobjc2,davidchisnall/libobjc2