BigInts should be folded during constant evaluation

[dead-claudia]

Bug report or Feature request? Feature request

Version (complete output of terser -V or specific git commit) 5.17.3

Complete CLI command or minify() options used
terser --compress --mangle --module

terser input

const a = 1n
export const b = a + 2n
export const c = 4n + 5n

terser output or error

export const b=1n+2n;export const c=4n+5n;

Expected result

export const b=3n;export const c=9n;

[fabiosantoscode]

Thanks for these. This is a slow project and I have to give priority to bugs, but sometimes I get to these as well :)