[SYCL][Docs] Move sycl_ext_oneapi_profiling_tag to experimental (#14165)

This commit moves the sycl_ext_oneapi_profiling_tag extension to
experimental. There are some known issues with this exentsion,
specifically on OpenCL (fallback solution) and on CUDA and HIP backends.

Signed-off-by: Larsen, Steffen <[email protected]>

Author: steffenlarsen

sycl/doc/extensions/proposed/sycl_ext_oneapi_profiling_tag.asciidoc renamed to sycl/doc/extensions/experimental/sycl_ext_oneapi_profiling_tag.asciidoc

@@ -44,12 +44,10 @@ the SYCL specification refer to that revision.
 
 == Status
 
-This is a proposed extension specification, intended to gather community
-feedback.
-Interfaces defined in this specification may not be implemented yet or may be
-in a preliminary state.
-The specification itself may also change in incompatible ways before it is
-finalized.
+This is an experimental extension specification, intended to provide early
+access to features and gather community feedback.  Interfaces defined in this
+specification are implemented in {dpcpp}, but they are not finalized and may
+change incompatibly in future versions of {dpcpp} without prior notice.
 *Shipping software products should not rely on APIs defined in this
 specification.*
 
@@ -67,7 +65,7 @@ passed).
 
 This extension is structured as a free function, rather than a member function
 on `queue`, in order to be consistent with the API design in
-link:../proposed/sycl_ext_oneapi_enqueue_functions.asciidoc[
+link:../experimental/sycl_ext_oneapi_enqueue_functions.asciidoc[
 sycl_ext_oneapi_enqueue_functions]
 
 

sycl/source/feature_test.hpp.in

@@ -109,6 +109,7 @@ inline namespace _V1 {
 #define SYCL_EXT_ONEAPI_PROD 1
 #define SYCL_EXT_ONEAPI_ENQUEUE_FUNCTIONS 1
 #define SYCL_EXT_ONEAPI_RAW_KERNEL_ARG 1
+#define SYCL_EXT_ONEAPI_PROFILING_TAG 1
 
 #ifndef __has_include
 #define __has_include(x) 0