Before this a closing html comment would not be treated as a comment if
directly following a block comment which was not the first token of its
first line.
Stage 3 since August 2019 - we already have shebang stripping
implemented in js(1), so this removes it from there in favor of adding
support to the lexer directly.
Most straightforward proposal and implementation I've ever seen :^)
https://github.com/tc39/proposal-hashbang
Since we have had eval() for a while now, we can finally use it here -
this allows us to get rid of the confusing return statements in tested
source code.
