Commits on Oct 1, 2021

1. Cache head getter in PathExpressionImplV1 …

   This is one of the hot paths during normalization, and it in turn calls
   the *hottest* paths of normalization (`hbsPosFor` and `hbsCharFor`).
   Adding this cache improves performance againt the baseline by nearly 50%
   of the current delta:
   
   |           variant            | average | min  | max  |
   | ---------------------------- | ------- | ---- | ---- |
   | @glimmer/compiler@0.65.3     | 6901.4  | 6812 | 6944 |
   | @glimmer/compiler@master     | 9000.4  | 8925 | 9041 |
   | @glimmer/compiler@experiment | 8144.8  | 8078 | 8240 |

   

   chriskrycho committed Oct 1, 2021
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