[clang] [CIR] Upstream global variable linkage types (PR #129072)

[Bruno Cardoso Lopes via cfe-commits]

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@@ -0,0 +1,11 @@
+// Linkage types of global variables
+// RUN: %clang_cc1 -std=c++20 -triple x86_64-unknown-linux-gnu -fclangir -emit-cir %s -o -  | FileCheck %s
+
+int aaaa;
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bcardosolopes wrote:

This new tests uses_this_convention and while the existing-uses-this, I suggest you-keep-this-uniform.

https://github.com/llvm/llvm-project/pull/129072