tcg: Increase minimum alignment from tcg_malloc to 8
For a 64-bit ILP32 host, aligning to sizeof(long) is not enough.
Guess the minimum for any host is 8, as that covers uint64_t.
Qemu doesn't use a host long double or host vectors, except in
extremely limited circumstances.
Fixes a bus error for a sparc v8plus host.
Signed-off-by: NRichard Henderson <rth@twiddle.net>
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