Fix compilation on MSVC

BUG=

Change-Id: I9f33a4c26cc2ca1e6d6cdbc245d929175867b1e5
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/13961
Commit-Queue: Austin Eng <enga@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Jiawei Shao <jiawei.shao@intel.com>

src/tests/perf_tests/DrawCallPerf.cpp

@@ -124,6 +124,7 @@ namespace {
                                       UniformData::Static, RenderBundle::No};
 
         unsigned int unused[] = {
+            0,  // Avoid making a 0-sized array.
             AssignParam(std::get<Ts>(paramTuple), args)...,
         };
         DAWN_UNUSED(unused);