OpIsHelperInvocationEXT should declare relevant SPV extension and capability

SPIRV/GlslangToSpv.cpp

@@ -7619,8 +7619,9 @@ spv::Id TGlslangToSpvTraverser::createNoArgOperation(glslang::TOperator op, spv:
     case glslang::EOpIsHelperInvocation:
     {
         std::vector<spv::Id> args; // Dummy arguments
-        spv::Id id = builder.createOp(spv::OpIsHelperInvocationEXT, typeId, args);
-        return id;
+        builder.addExtension(spv::E_SPV_EXT_demote_to_helper_invocation);
+        builder.addCapability(spv::CapabilityDemoteToHelperInvocationEXT);
+        return builder.createOp(spv::OpIsHelperInvocationEXT, typeId, args);
     }
 
     case glslang::EOpReadClockSubgroupKHR: {