target/i386: do not use s->tmp0 for jumps on ECX ==/!= 0 Create a new temporary, to ease the register allocator's work. Creation of the temporary is pushed into gen_ext_tl, which also allows NULL as the first parameter now. Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>