[clang] Fix Lambda Mangling in Namespace-Scope Variable Initializers. (PR #159115)

[Tom Honermann via cfe-commits]

================
@@ -0,0 +1,40 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu \
+// RUN: -aux-triple nvptx64-nvidia-cuda -fcuda-is-device \
+// RUN: -x cuda -emit-llvm %s -o - | FileCheck %s --check-prefix=DEVICE
+
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu \
+// RUN: -aux-triple nvptx64-nvidia-cuda  \
+// RUN: -x cuda -emit-llvm %s -o - | FileCheck %s --check-prefix=HOST
+
+int cudaConfigureCall(int, int, decltype(sizeof(int)) = 0, void* = nullptr);
+namespace QL {
+auto dg1 = [] { return 1; };
+}
+namespace QL {
+auto dg2 = [] { return 2; };
+}
+using namespace QL;
+template<typename T>
+__attribute__((global)) void f(T t) {
+  t();
+}
+void g() {
+  f<<<1,1>>>(dg1);
+  f<<<1,1>>>(dg2);
+}
+
+// HOST: @_ZN2QL3dg1E = internal global %class.anon undef, align 1
+// HOST: @_ZN2QL3dg2E = internal global %class.anon.0 undef, align 1
+
+// DEVICE: define void @_Z1fIN2QL3dg1MUlvE_EEvT_
+// DEVICE: call noundef i32 @_ZNK2QL3dg1MUlvE_clEv
+// DEVICE: define internal noundef i32 @_ZNK2QL3dg1MUlvE_clEv
+// DEVICE: define void @_Z1fIN2QL3dg2MUlvE_EEvT_
+// DEVICE: call noundef i32 @_ZNK2QL3dg2MUlvE_clEv
+// DEVICE: define internal noundef i32 @_ZNK2QL3dg2MUlvE_clEv
+
+// HOST: define dso_local void @_Z1gv
+// HOST: call void @_Z16__device_stub__fIN2QL3dg1MUlvE_EEvT_
+// HOST: call void @_Z16__device_stub__fIN2QL3dg2MUlvE_EEvT_
+// HOST: define internal void @_Z16__device_stub__fIN2QL3dg1MUlvE_EEvT_
+// HOST: define internal void @_Z16__device_stub__fIN2QL3dg2MUlvE_EEvT_
----------------
tahonermann wrote:

I was thinking that we could just add these cases to the existing `unnamed-types.cu` test.

https://github.com/llvm/llvm-project/pull/159115