Tests: Update comments in test/IRGen/objc.swift.

Author: tshortli

test/IRGen/objc.swift

@@ -140,6 +140,6 @@ class WeakObjC {
 // CHECK:  i32 1, !"Objective-C Image Info Version", i32 0}
 // CHECK:  i32 1, !"Objective-C Image Info Section", !"__DATA,__objc_imageinfo,regular,no_dead_strip"}
 //   100730624 == (6 << 24) | (1 << 16) | (7 << 8).
-//     5 and 8 is the current major.minor version. 7 is the Swift ABI version.
+//     6 and 1 is the current major.minor version. 7 is the Swift ABI version.
 // CHECK:  i32 4, !"Objective-C Garbage Collection", i32 100730624}
 // CHECK:  i32 1, !"Swift Version", i32 7}