update csmith driver
optimize processing of things like false & constant, add getFastValue in makeSignOp, and add fuzz tests that now pass
limit memory growth to 1GB
assert on emscript child processes returning forwarded data, if not, they may have aborted prematurely
improve c autodebugger
do not use packed structs in fuzzer, we don't really support that
commented-out debugging stuff
fuzz through bytecode, so the native build is 32-bit even on 64-bit systems, like the js build
notice segfaults in native fuzz builds
fuzz both a native and a native-through-llvm build, in hopes of avoiding bugs in both