nv50/ir: Initialize Program members in constructor.

Fix defects reported by Coverity Scan.

uninit_member: Non-static class member tlsSize is not initialized in this constructor nor in any functions that it calls.
uninit_member: Non-static class member driver is not initialized in this constructor nor in any functions that it calls.
uninit_member: Non-static class member driver_out is not initialized in this constructor nor in any functions that it calls.

Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7703>

src/gallium/drivers/nouveau/codegen/nv50_ir.cpp

@@ -1169,13 +1169,16 @@ FlowInstruction::clone(ClonePolicy<Function>& pol, Instruction *i) const
 Program::Program(Type type, Target *arch)
    : progType(type),
      target(arch),
+     tlsSize(0),
      mem_Instruction(sizeof(Instruction), 6),
      mem_CmpInstruction(sizeof(CmpInstruction), 4),
      mem_TexInstruction(sizeof(TexInstruction), 4),
      mem_FlowInstruction(sizeof(FlowInstruction), 4),
      mem_LValue(sizeof(LValue), 8),
      mem_Symbol(sizeof(Symbol), 7),
-     mem_ImmediateValue(sizeof(ImmediateValue), 7)
+     mem_ImmediateValue(sizeof(ImmediateValue), 7),
+     driver(NULL),
+     driver_out(NULL)
 {
    code = NULL;
    binSize = 0;