glsl_to_tgsi: use TGSI opcodes when converting from GLSL IR
Before, the translator used Mesa IR opcodes (a holdover from ir_to_mesa) and converted them to TGSI opcodes during TGSI emission.
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Before, the translator used Mesa IR opcodes (a holdover from ir_to_mesa) and converted them to TGSI opcodes during TGSI emission.