[llvm] [AMDGPU] Update pal metadata for v3.6 (PR #135196)

[Jay Foad via llvm-commits]

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@@ -22,6 +22,7 @@ namespace llvm {
 
 class Module;
 class StringRef;
+class VersionTuple;
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jayfoad wrote:

Nit: does this actually do anything? Given that you return a `VersionTuple` by value below, I'd expect to need a complete definition of VersionTuple not just a forward declaration. But I could be wrong...

The same goes for the existing forward definition of `StringRef`.

https://github.com/llvm/llvm-project/pull/135196