CL: Fix Non-Uniform Query check

The following method needs updating:
https://github.com/google/angle/blob/main/src/libANGLE/CLDevice.cpp#L424

It currently does not account for lower OpenCL driver versions that
do not contain the query value:
CL_DEVICE_NON_UNIFORM_WORK_GROUP_SUPPORT

As this was only introduced as of OpenCL 3.0 support
https://registry.khronos.org/OpenCL/specs/3.0-unified/html/OpenCL_API.html#CL_DEVICE_NON_UNIFORM_WORK_GROUP_SUPPORT

Bug: angleproject:381335059
Change-Id: I9f1e61270690077bdca0be3aef0d88b77c27bf11
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6068289
Reviewed-by: Cody Northrop <cnorthrop@google.com>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>

src/libANGLE/CLDevice.cpp

@@ -425,10 +425,24 @@ bool Device::supportsNonUniformWorkGroups() const
 {
     cl_bool support = false;
 
-    if (IsError(mImpl->getInfoUInt(DeviceInfo::NonUniformWorkGroupSupport, &support)))
+    if (getPlatform().isVersionOrNewer(3, 0))
     {
-        UNREACHABLE();
+        if (IsError(mImpl->getInfoUInt(DeviceInfo::NonUniformWorkGroupSupport, &support)))
+        {
+            UNREACHABLE();
+        }
     }
+    else
+    {
+        // Check older platforms support via device extension
+        // TODO(aannestrand) Boolean-ify these extension strings rather than string compare
+        // http://anglebug.com/381335059
+        if (getInfo().extensions.find("cl_arm_non_uniform_work_group_size") != std::string::npos)
+        {
+            support = true;
+        }
+    }
+
     return support;
 }