[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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@@ -0,0 +1,5 @@
+; RUN: not llvm-as %s 2>&1 | FileCheck %s
+
+; CHECK: error: not a number, or does not fit in an unsigned int
+
+target datalayout = "z:neg"
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Pierre-vh wrote:

Those should be unit tests in `DataLayoutTest`, IMO.

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