tcg: Use offsets not indices for TCGv_*
Using the offset of a temporary, relative to TCGContext, rather than its index means that we don't use 0. That leaves offset 0 free for a NULL representation without having to leave index 0 unused. Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: NEmilio G. Cota <cota@braap.org> Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>
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