[clang] [Clang] Emit error for duplicate mangled names within a lambda (PR #107581)

[Kerry McLaughlin via cfe-commits]

================
@@ -0,0 +1,31 @@
+// REQUIRES: aarch64-registered-target
+
+// RUN: %clang_cc1 -triple aarch64 -emit-llvm -o - %s -verify -DTEST1
+// RUN: %clang_cc1 -triple aarch64 -target-feature +sme -target-feature +sme2 -emit-llvm -o - %s -verify -DTEST2
----------------
kmclaughlin-arm wrote:

I've removed the ifdefs & renamed this to `lambda-instantiation-mangling-conflicts.cpp` as it was a bit shorter, but I can rename to `lambda-instantiation-require-different-mangled-names.cpp` if preferred.

https://github.com/llvm/llvm-project/pull/107581