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ae3bb879c7
FS.mkdir() will throw a javascript exception if the scratch directory already
exists, so catch/ignore that.
Wrap the rest of the scratch i/o in a try/catch block; the event will only
send if everything works out.
Wrap some calls from Javascript to the C runtime's free() in an
EMSCRIPTEN_KEEPALIVE function, so that the compiler doesn't optimize the
function out and crash at runtime.
Fixes #14999.
(cherry picked from commit 267e681a0b)