[clang] [CUDA][HIP] capture possible ODR-used var (PR #136645)

[Artem Belevich via cfe-commits]

================
@@ -1100,3 +1101,49 @@ std::string SemaCUDA::getConfigureFuncName() const {
   // Legacy CUDA kernel configuration call
   return "cudaConfigureCall";
 }
+
+// Record any local constexpr variables that are passed one way on the host
+// and another on the device.
+void SemaCUDA::recordPotentialODRUsedVariable(
+    MultiExprArg Arguments, OverloadCandidateSet &Candidates) {
+  sema::LambdaScopeInfo *LambdaInfo = SemaRef.getCurLambda();
+  if (!LambdaInfo)
+    return;
+
+  for (unsigned I = 0; I < Arguments.size(); ++I) {
+    auto *DeclRef = dyn_cast<DeclRefExpr>(Arguments[I]);
+    if (!DeclRef)
+      continue;
+    auto *Variable = dyn_cast<VarDecl>(DeclRef->getDecl());
+    if (!Variable || !Variable->isLocalVarDecl() || !Variable->isConstexpr())
+      continue;
+
+    bool HostByValue = false, HostByRef = false;
+    bool DeviceByValue = false, DeviceByRef = false;
----------------
Artem-B wrote:

I'd move them do to where we use them.

https://github.com/llvm/llvm-project/pull/136645