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x86_64: fix packedStore miscomp by spilling EFLAGS

Fixes #20113 and #20581.

AND instructions in packedStore clobbers EFLAGS.

Bug: https://github.com/ziglang/zig/issues/20113
Bug: https://github.com/ziglang/zig/issues/20581
Signed-off-by: Bingwu Zhang <xtex@aosc.io>
c62fb118e7Bingwu Zhang committed on 3/22/2025, 8:06:07 AMparent9c9d393
1 file changedLine totals unavailable