From the benchmarks at https://crrev.com/1317113007/

With patch:
```
Running suite: JSTests/RestParameters
Stdout (#1):
RestParameters-Object(Score): 1244310

Stdout (#2):
RestParameters-Object(Score): 1276450

Stdout (#3):
RestParameters-Object(Score): 1384960

Stdout (#4):
RestParameters-Object(Score): 1414450

Stdout (#5):
RestParameters-Object(Score): 1323190
```

Without the patch:

```
Running suite: JSTests/RestParameters
Stdout (#1):
RestParameters-Object(Score): 544610

Stdout (#2):
RestParameters-Object(Score): 545360

Stdout (#3):
RestParameters-Object(Score): 523450

Stdout (#4):
RestParameters-Object(Score): 529600

Stdout (#5):
RestParameters-Object(Score): 510410
```

Which looks like a pretty significant improvement for the
no-parameter-expressions case. The other cases seem mostly predicated on
improving hole-checking logic in the interpreter and compilers

https://codereview.chromium.org/1308123007/

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