[test] Initial import of an emscripten test suite.

test/emscripten/core/test_memcpy3-Os.out

Index: test/emscripten/core/test_memcpy3-Os.out
diff --git a/test/emscripten/core/test_memcpy3-Os.out b/test/emscripten/core/test_memcpy3-Os.out
new file mode 100644
index 0000000000000000000000000000000000000000..6f39e709e22eae5f6229ec4c784b54833062bdeb
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