Avi Kivity f58151d191
test: mutation_test: fix initialization order bug with thread local storage ...
test_cell_external_memory_usage uses with_allocator() to observe how some
types allocate memory. However, compiler reordering (observed with clang 11
on aarch64) can move the various thread-local CQL type object initialization
into the with_allocator() scope; so any managed object allocated as part of
this initialization also gets measured, and the test fails. The code movement
is legal, as far as I can tell.
Fix this by initializing the type object early; use an atomic_thread_fence
as an optimization barrier so the compiler doesn't eliminate the or move
the early initialization.
Closes #7951
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f58151d191