tcg: add dup_const_tl wrapper

tcg: add dup_const_tl wrapper

dup_const always generates a uint64_t, which may exceed the size of a
target_long (generating warnings with recent-enough compilers).

To ensure that we can use dup_const both for 64bit and 32bit targets,
this adds dup_const_tl, which either maps back to dup_const (for 64bit
targets) or provides a similar implementation using 32bit constants.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Philipp Tomsich <philipp.tomsich@vrull.eu>
Message-Id: <20211003214243.3813425-1-philipp.tomsich@vrull.eu>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>