Merging LLVM compatibility patches

Supporting LLVM trunk revision 375d93465b3e6f342e0554cfaee308a45a523969

Author: Build Automation

external/llvm/releases/15.0.0/patches_external/custom_intrinsics_index_check.patch

@@ -0,0 +1,36 @@
+/*========================== begin_copyright_notice ============================
+
+Copyright (C) 2025 Intel Corporation
+
+SPDX-License-Identifier: MIT
+
+============================= end_copyright_notice ===========================*/
+
+/*========================== begin_copyright_notice ============================
+
+Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+See https://llvm.org/LICENSE.txt for license information.
+SPDX-License-Identifier: Apache-2.0 with LLVM-exception
+
+============================= end_copyright_notice ===========================*/
+
+This is a cherry-pick of commit https://github.com/llvm/llvm-project/commit/a87738f86b17f4a8dcde538c60826506e2a27ed1:
+
+"[AutoUpgrade] Don't upgrade intrinsics returning overloaded struct type"
+
+---
+
+diff --git a/llvm/lib/IR/AutoUpgrade.cpp b/llvm/lib/IR/AutoUpgrade.cpp
+index 7b9c55ff3..d0d5c9f4e 100644
+--- a/llvm/lib/IR/AutoUpgrade.cpp
++++ b/llvm/lib/IR/AutoUpgrade.cpp
+@@ -1131,7 +1131,8 @@ static bool UpgradeIntrinsicFunction1(Function *F, Function *&NewFn) {
+   }
+
+   auto *ST = dyn_cast<StructType>(F->getReturnType());
+-  if (ST && (!ST->isLiteral() || ST->isPacked())) {
++  if (ST && (!ST->isLiteral() || ST->isPacked()) &&
++      F->getIntrinsicID() != Intrinsic::not_intrinsic) {
+     // Replace return type with literal non-packed struct. Only do this for
+     // intrinsics declared to return a struct, not for intrinsics with
+     // overloaded return type, in which case the exact struct type will be

external/llvm/trunk/patches_external/custom_intrinsics_index_check.patch

@@ -0,0 +1,36 @@
+/*========================== begin_copyright_notice ============================
+
+Copyright (C) 2025 Intel Corporation
+
+SPDX-License-Identifier: MIT
+
+============================= end_copyright_notice ===========================*/
+
+/*========================== begin_copyright_notice ============================
+
+Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+See https://llvm.org/LICENSE.txt for license information.
+SPDX-License-Identifier: Apache-2.0 with LLVM-exception
+
+============================= end_copyright_notice ===========================*/
+
+This is a cherry-pick of commit https://github.com/llvm/llvm-project/commit/a87738f86b17f4a8dcde538c60826506e2a27ed1:
+
+"[AutoUpgrade] Don't upgrade intrinsics returning overloaded struct type"
+
+---
+
+diff --git a/llvm/lib/IR/AutoUpgrade.cpp b/llvm/lib/IR/AutoUpgrade.cpp
+index 7b9c55ff3..d0d5c9f4e 100644
+--- a/llvm/lib/IR/AutoUpgrade.cpp
++++ b/llvm/lib/IR/AutoUpgrade.cpp
+@@ -1131,7 +1131,8 @@ static bool UpgradeIntrinsicFunction1(Function *F, Function *&NewFn) {
+   }
+
+   auto *ST = dyn_cast<StructType>(F->getReturnType());
+-  if (ST && (!ST->isLiteral() || ST->isPacked())) {
++  if (ST && (!ST->isLiteral() || ST->isPacked()) &&
++      F->getIntrinsicID() != Intrinsic::not_intrinsic) {
+     // Replace return type with literal non-packed struct. Only do this for
+     // intrinsics declared to return a struct, not for intrinsics with
+     // overloaded return type, in which case the exact struct type will be