nv50/ir/tgsi: move call to tgsi_scan_shader inside Source constructor
We actually need it there already, we just missed to move it.
Fixes: 66ed9792 ("nv50: Clear nv50_ir_prog_info of dead and codegen specific variables")
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We actually need it there already, we just missed to move it.
Fixes: 66ed9792 ("nv50: Clear nv50_ir_prog_info of dead and codegen specific variables")