[SPIR-V] Enable spirv-val in SPV_KHR_shader_clock test (#93292)

Validation succeeds on this test since SPIRV-Tools commit `e2646f5e
("spirv-val: Consider target env for OpReadClockKHR scope",
2024-05-21)`.

Author: svenvh

llvm/test/CodeGen/SPIRV/extensions/SPV_KHR_shader_clock/shader_clock.ll

@@ -1,6 +1,6 @@
 ; RUN: not llc -O0 -mtriple=spirv64-unknown-unknown %s -o %t.spvt 2>&1 | FileCheck %s --check-prefix=CHECK-ERROR
 ; RUN: llc -O0 -mtriple=spirv64-unknown-unknown --spirv-ext=+SPV_KHR_shader_clock %s -o - | FileCheck %s
-; TODO: %if spirv-tools %{ llc -O0 -mtriple=spirv64-unknown-unknown --spirv-ext=+SPV_KHR_shader_clock %s -o - -filetype=obj | spirv-val %}
+; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv64-unknown-unknown --spirv-ext=+SPV_KHR_shader_clock %s -o - -filetype=obj | spirv-val %}
 
 ; CHECK-ERROR: LLVM ERROR: clock_read_device: the builtin requires the following SPIR-V extension: SPV_KHR_shader_clock