This fixes a non-determinism issue in the asm produced for this function when cross-compiling on x86_64 and aarch64 for the arm-linux-gnueabihf HOST.
Related to #21194. Alternative to #25636. Initial discussion in #24615 (comment).
Guix Build (x86_64):
028ae0ec2874ead334edd1c5dc509344379d82f7058b649c9076992defd7190d7 guix-build-c32fa85909dd/output/arm-linux-gnueabihf/SHA256SUMS.part
148d34073b029c4f62c8e1bd906533610228d5ca0bb5eefea6010dfa7372ba067 guix-build-c32fa85909dd/output/arm-linux-gnueabihf/bitcoin-c32fa85909dd-arm-linux-gnueabihf-debug.tar.gz
2850d6e9859e88bcb93ed586bdb0c0bc95a44249d6a0ec1b1d13125cb9dd56413 guix-build-c32fa85909dd/output/arm-linux-gnueabihf/bitcoin-c32fa85909dd-arm-linux-gnueabihf.tar.gz
3b8bb092b1307684ea4b53d810ac110ec14f29eeab8028d924d1cac7418009b14 guix-build-c32fa85909dd/output/dist-archive/bitcoin-c32fa85909dd.tar.gz
Guix Build (arm64):
028ae0ec2874ead334edd1c5dc509344379d82f7058b649c9076992defd7190d7 guix-build-c32fa85909dd/output/arm-linux-gnueabihf/SHA256SUMS.part
148d34073b029c4f62c8e1bd906533610228d5ca0bb5eefea6010dfa7372ba067 guix-build-c32fa85909dd/output/arm-linux-gnueabihf/bitcoin-c32fa85909dd-arm-linux-gnueabihf-debug.tar.gz
2850d6e9859e88bcb93ed586bdb0c0bc95a44249d6a0ec1b1d13125cb9dd56413 guix-build-c32fa85909dd/output/arm-linux-gnueabihf/bitcoin-c32fa85909dd-arm-linux-gnueabihf.tar.gz
3b8bb092b1307684ea4b53d810ac110ec14f29eeab8028d924d1cac7418009b14 guix-build-c32fa85909dd/output/dist-archive/bitcoin-c32fa85909dd.tar.gz