Auto merge of #98097 - lqd:const-alloc-hash, r=oli-obk

ctfe: limit hashing of big const allocations when interning

Const allocations are only hashed for interning. However, they can be large, making the hashing expensive especially since it uses `FxHash`: it's better suited to short keys, not potentially big buffers like the actual bytes of allocation and the associated 1/8th sized `InitMask`.

We can partially hash these fields when they're large, hashing the length, and head and tail of these buffers, to
limit possible collisions while avoiding most of the hashing work.

r? `@ghost`

0 files changed, 0 insertions, 0 deletions