glsl: fix uninitialized instance variable

Valgrind detected that variable ir_copy_propagation_visitor::killed_all
is uninitialized.

Signed-off-by: Jan Ziak (http://atom-symbol.net) <0xe2.0x9a.0x9b@gmail.com>
Signed-off-by: Rob Clark <robdclark@gmail.com>
1 file changed