Transpiler: Improve tree shaking support

[sunag]

Description

Added PURE and inline setLayout() making it more compatible with tree shaking.

import { pow2, float, sub, sqrt, EPSILON, max, div, tslFn } from 'three/nodes';

export const V_GGX_SmithCorrelated = /*#__PURE__*/ tslFn( ( [ alpha, dotNL, dotNV ] ) => {

	const a2 = float( pow2( alpha ) ).toVar();
	const gv = float( dotNL.mul( sqrt( a2.add( sub( 1.0, a2 ).mul( pow2( dotNV ) ) ) ) ) ).toVar();
	const gl = float( dotNV.mul( sqrt( a2.add( sub( 1.0, a2 ).mul( pow2( dotNL ) ) ) ) ) ).toVar();

	return div( 0.5, max( gv.add( gl ), EPSILON ) );

} ).setLayout( {
	name: 'V_GGX_SmithCorrelated',
	type: 'float',
	inputs: [
		{ name: 'alpha', type: 'float', qualifier: 'in' },
		{ name: 'dotNL', type: 'float', qualifier: 'in' },
		{ name: 'dotNV', type: 'float', qualifier: 'in' }
	]
} );