Disable COMDAT folding and OptimizeReferences for debug WinRT
Disable COMDAT folding and OptimizeReferences for debug WinRT

In some configs these are enabled by default, and they causes linker
warnings (which are treated as errors).

BUG=angleproject:1250

Change-Id: Ia8d28e313c91f1d63248aa5c68d29f9c69b8d596
Reviewed-on: https://chromium-review.googlesource.com/317566
Tryjob-Request: Austin Kinross <4e7ea65cff3a7294234757a0f33c94811ce2f382@microsoft.com>
Tested-by: Austin Kinross <4e7ea65cff3a7294234757a0f33c94811ce2f382@microsoft.com>
Reviewed-by: Geoff Lang <b6fc25fe0362055230985c05cbfa8adb741ccc0f@chromium.org>
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>

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