[Feature Request] Minify String#repeat calls when appropriate

[LeoDog896]

When String#repeat is given a value with a known value (whether through inlining or directly), should run the repeat method whenever the result is smaller.

Input (with unsafe compress set to true):

export const a = "a".repeat(4);

Terser Output:

export const a="a".repeat(4);

Expected output:

export const a="aaaa";