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tcg: Avoid undefined behaviour patching code at unaligned addresses
To avoid C undefined behaviour when patching generated code, provide wrappers tcg_patch8/16/32/64 which use the usual memcpy trick, and use them in the i386 backend. Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <rth@twiddle.net>
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