221a222,224
> // This algorithm requires a reasonably low use count before finding a match
> // to avoid uselessly blowing up compile time in large blocks.
> unsigned UseCount = 0;
223c226
< I != E; ++I) {
---
> I != E && UseCount < 100; ++I, ++UseCount) {
239a243,244
> // Reset UseCount to allow more matches.
> UseCount = 0;