feat(Compiler): Allow opt-in/out of the new `preserveWhitespace: false`.
feat(Compiler): Allow opt-in/out of the new `preserveWhitespace: false`.

This will allow some internal users to set:
"use_legacy_preserve_whitespace" = True

... to temporarily opt-out of the new feature.

PiperOrigin-RevId: 194320195

matanlurey/angular,matanlurey/angular,chalin/angular2,angulardart/angular,matanlurey/angular,chalin/angular2,angulardart/angular,chalin/angular2,angulardart/angular