More untagged variant output inefficiency

[cknitt]

Followup to #7138:

Consider the output here:
https://github.com/rescript-lang/rescript-compiler/blob/41e2fd64dc166a6f092d65ddbf607d4b2878f0b4/tests/tests/src/UntaggedVariants.mjs#L403

          if (match$3 === undefined || match$3 === null || match$3 === false || match$3 === true) {
            console.log("Nope...");
            return;
          }
          if (typeof match$3 === "string" && match$3 === "My name is") {

could just be

          if (match$3 === "My name is") {