[OpenCL][Docs] 10.x release notes

[Anastasia]

Summary

Summary of major changes for OpenCL support in clang 11.

[svenvh]

clang/docs/ReleaseNotes.rst

267–293

cl_khr_extended_subgroups (ends with -s)?

But isn't it supposed to be cl_khr_subgroup_extensions? I am really confused now.

275

Drop "in".

277

functions

[Anastasia]

• Addressed comments from Sven.

[Anastasia]

Fixed extra space

[svenvh]

LGTM!

[Anastasia]

@hans, would you be able to commit this to the release branch?

PS, as I am away from next week I am looping in @mantognini for any follow up.

[hans]

In D86626#2243876, @Anastasia wrote:

@hans, would you be able to commit this to the release branch?

Committed dae9fe408793def8a49f5e1d10d2a859627785e3. Thanks!

[Anastasia]

https://reviews.llvm.org/rGdae9fe408793def8a49f5e1d10d2a859627785e3

clang/docs/ReleaseNotes.rst

 Objective-C Language Changes in Clang
 -------------------------------------
 
-OpenCL C Language Changes in Clang
-----------------------------------
+OpenCL Kernel Language Changes in Clang
+---------------------------------------
 
-...
+- Added extensions from `cl_khr_subgroup_extensions` to clang and the internal
+  header.
+
+- Added rocm device libs linking for AMDGPU.
+
+- Added diagnostic for OpenCL 2.0 blocks used in function arguments.
+
+- Fixed MS mangling for OpenCL 2.0 pipe type specifier.
+
+- Improved command line options for fast relaxed math.
+
+- Improved `atomic_fetch_min/max` functions in the internal header
+  (`opencl-c.h`).
+
+- Improved size of builtin function table for `TableGen`-based internal header
+  (enabled by `-fdeclare-opencl-builtins`) and added new functionality for
+  OpenCL 2.0 atomics, pipes, enqueue kernel, `cl_khr_subgroups`,
+  `cl_arm_integer_dot_product`.
+
+Changes related to C++ for OpenCL
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+- Added `addrspace_cast` operator.
+
+- Improved address space deduction in templates.
+
+- Improved diagnostics of address spaces in nested pointer conversions.
 
 ABI Changes in Clang
 --------------------