BUG: Fix cache use regression #29046
Merged
+15
−18
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Backport of gh-29041.
gh-29006 got the branching wrong leaving the cache undefined on most GCC/clang, which means we wouldn't use it.
Also move it up so that we can just remove the unused globals entirely.
May not close gh-29038, but to me should remove the milestone (because we need more info to have confidence that there was a regression).