Mac: Support only 64-bit to get modern runtime that can synthesize ivars
Mac: Support only 64-bit to get modern runtime that can synthesize ivars

igorsales/OCMockito,nschum/OCMockito,nschum/OCMockito,jonreid/OCMockito,SinnerSchraderMobileMirrors/OCMockito,jonreid/OCMockito,igorsales/OCMockito,SinnerSchraderMobileMirrors/OCMockito,jonreid/OCMockito,SinnerSchraderMobileMirrors/OCMockito