GH-118943: Fix a race condition when generating jit_stencils.h
#118957
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Write to a temporary file first, then rename it to the intended
jit_stencils.h
file. This keeps other build steps from assuming that the file has been successfully generated when it's still in the process of being written.CC: @savannahostrowski
jit.c
may be built with an incompletejit_stencils.h
#118943