Optimize ternary transpilation for assignments

[TwitchBronBron]

Whenever a ternary expression is on the right-hand-side of an assignment, dottedSet, or indexedSet statement, we can transpile the entire thing to an if statement instead which improves performance significantly (should be identical to handwritten non-ternary code).

This PR adds this if statement transpiling for all of the following situations:

• assignments: a = true ? 1 : 2
• dotted set: m.a = true ? 1 : 2
• indexed set: m["a"] = true ? 1 : 2
• complex assignment operators (i.e. +=, -=, etc...) size += true ? 1 : 2
• grouped ternaries: a = (((true ? 1 : 2)))
• nested ternaries a = true ? (false ? 1 : 2) : 3

These are explicit cases, so any situation other than these will be transpiled according to the existing rules (basic and scope safe)

Simple example:

a = true ? 1 : 2

becomes this:

if true then
    a = 1
else
    a = 2
end if

Nested example:

result = true ? (false ? "one" : "two") : "three"

becomes this:

if true then
    if false then
        result = "one"
    else
        result = "two"
    end if
else
    result = "three"
end if

This benchmark shows a significant improvement in performace

[jtuckerfubo]

lgtm

[rokucommunity-bot]

Hey there! I just built a new temporary npm package based on 7fee5a1. You can download it here or install it by running the following command:

npm install https://github.com/rokucommunity/brighterscript/releases/download/v0.0.0-packages/brighterscript-0.67.8-ternary-to-if-statement.20241121134906.tgz