servo: Merge #17710 - Revert "Auto merge of #17701 - bholley:reuse_allocations, r=emilio" (from emilio:revert-bloom-sharing); r=heycam

This reverts commit ebfc8f585834948f9b7564ffe382a6e266edf738, reversing
changes made to 5585ff2c440dc27c8e98e834c9c0e9d956581b8e.

Animation code can reenter and create a new TLS context from the traversal
SequentialTask, so this won't work as written, and it's making test fails.

Source-Repo: https://github.com/servo/servo
Source-Revision: 9d74ae890b31fc45452ae60af7d89573fc52a86f

--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : b993fffb20fc8371a4aa42163e6712b9f1ebf33d