Isolated emscripten in new lib

lib/emscripten/emtests/test_inlinejs.c

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2016 The Emscripten Authors.  All rights reserved.
+ * Emscripten is available under two separate licenses, the MIT license and the
+ * University of Illinois/NCSA Open Source License.  Both these licenses can be
+ * found in the LICENSE file.
+ */
+
+#include <stdio.h>
+
+double get() {
+  double ret = 0;
+  __asm __volatile__("Math.abs(-12/3.3)" : "=r"(ret));  // write to a variable
+  asm("#comment1");
+  asm volatile("#comment2");
+  asm volatile(
+      "#comment3\n"
+      "#comment4\n");
+  return ret;
+}
+
+int main() {
+  asm("out('Inline JS is very cool')");
+  printf("%.2f\n", get());
+
+  // Test that passing multiple input and output variables works.
+  int src1 = 1, src2 = 2, src3 = 3;
+  int dst1 = 0, dst2 = 0, dst3 = 0;
+  // TODO asm("out(%3); out(%4); out(%5); %0 = %3; %1
+  // = %4; %2 = %5;" : "=r"(dst1),"=r"(dst2),"=r"(dst3):
+  // "r"(src1),"r"(src2),"r"(src3));
+  // TODO printf("%d\n%d\n%d\n", dst1, dst2, dst3);
+
+  return 0;
+}