[libclc] libclc: Implement get_global_linear_id and get_local_linear_id (PR #184800)

[Matt Arsenault via cfe-commits]

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@@ -0,0 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include <clc/opencl/opencl-base.h>
+
+_CLC_OVERLOAD _CLC_DEF _CLC_CONST size_t get_local_linear_id() {
+  return (get_local_id(2) * get_local_size(1) + get_local_id(1)) *
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arsenm wrote:

Is there a point to doing this? I thought the point of putting code in clc was reuse inside of other functions. Nothing else would want to make use of these ones 

https://github.com/llvm/llvm-project/pull/184800