[llvm] [SPIR-V] Update docs to describe support of SPV_KHR_shader_clock (PR #93168)

[Vyacheslav Levytskyy via llvm-commits]

https://github.com/VyacheslavLevytskyy created https://github.com/llvm/llvm-project/pull/93168

This PR updates docs to describe support of SPV_KHR_shader_clock extension.

>From 98b6ef15b4ab122f5febbbee4ea475e4180d2471 Mon Sep 17 00:00:00 2001
From: "Levytskyy, Vyacheslav" <vyacheslav.levytskyy at intel.com>
Date: Thu, 23 May 2024 03:58:39 -0700
Subject: [PATCH] Update docs to describe support of SPV_KHR_shader_clock

---
 llvm/docs/SPIRVUsage.rst | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/llvm/docs/SPIRVUsage.rst b/llvm/docs/SPIRVUsage.rst
index d27177a4541a4..a0b3b3805044f 100644
--- a/llvm/docs/SPIRVUsage.rst
+++ b/llvm/docs/SPIRVUsage.rst
@@ -161,6 +161,8 @@ list of supported SPIR-V extensions, sorted alphabetically by their extension na
      - Allows to use the LinkOnceODR linkage type that lets a function or global variable to be merged with other functions or global variables of the same name when linkage occurs.
    * - ``SPV_KHR_no_integer_wrap_decoration``
      - Adds decorations to indicate that a given instruction does not cause integer wrapping.
+   * - ``SPV_KHR_shader_clock``
+     - Adds the extension cl_khr_kernel_clock that adds the ability for a kernel to sample the value from clocks provided by compute units.
    * - ``SPV_KHR_subgroup_rotate``
      - Adds a new instruction that enables rotating values across invocations within a subgroup.
    * - ``SPV_KHR_uniform_group_instructions``