[AMDGPU][True16][CodeGen] lower flat_d16_saddr_t16 to saddr inst (#166603) In true16 mode, D16 insts are lowered to a pseudo t16 first, and then lowered to hi/lo inst in MC lowering using D16T16 table. However, the D16T16 table selects both `flat_load_d16_t16 / flat_load_d16_t16_saddr` to `flat_load_d16_(hi)_b16` which is wrong. saddr pseudo inst `flat_load_d16_t16_saddr` should be selected to saddr hi/lo inst The global/scratch are correct while the flat seems to be the only one with this issue.
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