[llvm] [WIP] Extend data layout to add non zero null value for address space. (PR #83109)

[Pierre van Houtryve via llvm-commits]

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@@ -502,6 +502,27 @@ Error DataLayout::parseSpecifier(StringRef Desc) {
         return Err;
       break;
     }
+    case 'z': {
+      uint64_t AddrSpace = 0;
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Pierre-vh wrote:

addrspace is usually unsigned

https://github.com/llvm/llvm-project/pull/83109