constant folding

[michaelficarra]

Just a general reminder to do constant folding.

• "a" + "b" -> "ab"
• 0 + 1 -> 1
• typeof function(){} -> "function"
• etc.

[Constellation]

At first, we should implement tree based constant folindg (not considering variable)

[Constellation]

I've implemented tree-based-constant-folding pass! 9184d32c1acdec07a0355165573cd3458c905892

[Constellation]

In tree-based-constant-folding pass, additionally we should handle above pass,

• function expression
• array expression
• object expression

typeof function() { }