[test] Initial import of an emscripten test suite.

test/emscripten/core/test_memset-O3.out

Index: test/emscripten/core/test_memset-O3.out
diff --git a/test/emscripten/core/test_memset-O3.out b/test/emscripten/core/test_memset-O3.out
new file mode 100644
index 0000000000000000000000000000000000000000..7517e6ba601130295bfbfa38f26a56c65395221f
--- /dev/null
+++ b/test/emscripten/core/test_memset-O3.out
@@ -0,0 +1,81 @@
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