[llvm] [lipo] Support creating Universal 64 bit Mach-O files. (PR #67737)

[Jonas Devlieghere via llvm-commits]

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@@ -97,9 +97,11 @@ class Slice {
   }
 };
 
-Error writeUniversalBinary(ArrayRef<Slice> Slices, StringRef OutputFileName);
+Error writeUniversalBinary(ArrayRef<Slice> Slices, StringRef OutputFileName,
+                           bool UseFat64 = false);
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JDevlieghere wrote:

How about an enum like `FatHeaderType { FatHeader, Fat64Header }`?

https://github.com/llvm/llvm-project/pull/67737