perf: Improve @babel/types builders

[liuxingbaoyu]

Q	A
Fixed Issues?	Fixes #1, Fixes #2
Patch: Bug Fix?
Major: Breaking Change?
Minor: New Feature?
Tests Added + Pass?	Yes
Documentation PR Link
Any Dependency Changes?
License	MIT

Some discussion is needed.
Because it's a breaking change.
Ref: #13868

This PR makes fields and builderKeys only lookup once on initialization.

PS F:\babel\benchmark\babel-types\builders> node .\memberExpression.mjs
baseline memberExpression builder: 804_478 ops/sec ±0.52% (0.001ms)
current memberExpression builder: 7_391_582 ops/sec ±0.26% (0ms)
PS F:\babel\benchmark\babel-types\builders> node .\stringLiteral.mjs
baseline stringLiteral builder: 32_462_576 ops/sec ±0.42% (0ms)
current stringLiteral builder: 81_001_155 ops/sec ±0.6% (0ms)

[babel-bot]

Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/55175/

[nicolo-ribaudo]

Awesome performance numbers! I am in favor of landing this for Babel 8.

I'm wondering if maybe we can get even better numbers by inlining the validateInternal calls directly in the builder functions, at least for "pupular" nodes (Identifier, BinaryExpression, UnaryExpression, LogicalExpresssion, VariableDeclarator, VariableDeclaration, ...)

[nicolo-ribaudo]

Does the validation for required field still work with this field != null check?

[liuxingbaoyu]

It will work, I just followed here to check ahead.
https://github.com/babel/babel/pull/15843/files#diff-04a0d87b83569ab9a9d94ee801346cf5443ecf057bf35f4836d4a259e882c8fcR39
But thanks to you, I found another problem, validateChild was accidentally skipped. :)

[liuxingbaoyu]

Yes, performance gets better when we inline, but I'm not sure if that's the way to go since the size would increase a lot.
Maybe we can dynamically generate fast versions of them when new Function()/eval is available?
But I'm not sure if doing so under ESM would be difficult.

current

PS F:\babel\benchmark\babel-types\builders> node .\memberExpression.mjs
baseline memberExpression builder: 788_321 ops/sec ±0.65% (0.001ms)
current memberExpression builder: 7_414_300 ops/sec ±0.47% (0ms)

PS F:\babel\benchmark\babel-types\builders> node .\memberExpression.mjs
baseline memberExpression builder: 807_823 ops/sec ±0.46% (0.001ms)
current memberExpression builder: 12_744_969 ops/sec ±0.31% (0ms)

PS F:\babel\benchmark\babel-types\builders> node .\memberExpression.mjs
baseline memberExpression builder: 813_116 ops/sec ±0.43% (0.001ms)
current memberExpression builder: 10_822_404 ops/sec ±0.35% (0ms)