Take care of a bunch of pending GPU rebaselines and remove tests from ignored-tests.txt

expectations/gm/Test-Win7-ShuttleA-HD2000-x86-Debug/expected-results.json

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@@ skipping 4735 matching lines @@
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@@ skipping 168 matching lines @@
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@@ skipping 168 matching lines @@
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@@ skipping 626 matching lines @@
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@@ skipping 6446 matching lines @@
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@@ skipping 297 matching lines @@
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