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dd5d4a0e1e
x29 (FP) is a callee saved register and should be restored on return. Instead of backing up x29 and restoring it here, back up sp in a register that we are allowed to overwrite. This fixes crashes in checkasm on aarch64 since f1b3e1313851. For some reason, gcc builds didn't crash, but clang builds do. Signed-off-by: Martin Storsjö <martin@martin.st>