fix a minify bug with quoted property mangling

Author: evanw

internal/bundler/snapshots/snapshots_loader.txt

@@ -873,7 +873,7 @@ var { [foo("_keepThisProperty")]: x } = y;
 foo("_keepThisProperty") in x;
 
 ---------- /out/mangle.js ----------
-x._mangleThis, x?._mangleThis, x[y ? "a" : z], x?.[y ? "a" : z], x[y ? z : "a"], x?.[y ? z : "a"], x[y, "a"], x?.[y, "a"], "a" + "", (y, "a") + "", class {
+x.a, x?.a, x[y ? "a" : z], x?.[y ? "a" : z], x[y ? z : "a"], x?.[y ? z : "a"], x[y, "a"], x?.[y, "a"], "a" + "", (y, "a") + "", class {
   a = x;
 }, class {
   ["a"] = x;

internal/js_parser/js_parser.go

@@ -12522,12 +12522,7 @@ func (p *parser) visitExprInOut(expr js_ast.Expr, in exprIn) (js_ast.Expr, exprO
 		// "a['b']" => "a.b"
 		if p.options.minifySyntax {
 			if str, ok := e.Index.Data.(*js_ast.EString); ok && js_lexer.IsIdentifierUTF16(str.Value) {
-				dot := &js_ast.EDot{
-					Target:        e.Target,
-					Name:          helpers.UTF16ToString(str.Value),
-					NameLoc:       e.Index.Loc,
-					OptionalChain: e.OptionalChain,
-				}
+				dot := p.dotOrMangledPropParse(e.Target, js_lexer.MaybeSubstring{String: helpers.UTF16ToString(str.Value)}, e.Index.Loc, e.OptionalChain)
 				if isCallTarget {
 					p.callTarget = dot
 				}