Revert gen-type-aware-code.js to not use arrow functions for now, to aid beautification using old js shells.
Revert gen-type-aware-code.js to not use arrow functions for now, to aid beautification using old js shells.

MozillaSecurity/funfuzz,MozillaSecurity/funfuzz,MozillaSecurity/funfuzz,nth10sd/funfuzz,nth10sd/funfuzz,nth10sd/funfuzz