tcg: Introduce tcg_out_addi_ptr

Implement the function for arm, i386, and s390x, which will use it.
Add stubs for all other backends.

Reviewed-by: Alex BennĂ©e <[email protected]>
Reviewed-by: Daniel Henrique Barboza <[email protected]>
Signed-off-by: Richard Henderson <[email protected]>
11 files changed