Emit downlevel parameter initializers unless we are certain they don't have any side effects. #2109
+889
−168
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i.e. if you have:
function foo(a = "") { }
Then we can emit that as:
function foo(a) { }
but if you have:
function foo(a = bar()) { }
then we need to emit that as:
This also unifies some of emitting code between single line function blocks and other types of functions.