Add a sourceType="nonStrictModule" parse option
Add a sourceType="nonStrictModule" parse option

This is identical to sourceType="module" except that it does not
implicitly put parsing into strict mode. This will be useful for
gradually converting existing not-strict-safe code to implicitly strict
modules over time.

tldr: Never use this option for new module code. It's only intended as a
      temporary stopgap for converting non-es6 modules to es6 modules.

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