llvmpipe: lower mul 2x32_64

Fixes:
dEQP-VK.glsl.builtin.function.integer.umulextended*
dEQP-VK.glsl.builtin.function.integer.imulextended*

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6339>
diff --git a/src/gallium/drivers/llvmpipe/lp_screen.c b/src/gallium/drivers/llvmpipe/lp_screen.c
index 4fa3436..6447383 100644
--- a/src/gallium/drivers/llvmpipe/lp_screen.c
+++ b/src/gallium/drivers/llvmpipe/lp_screen.c
@@ -566,6 +566,7 @@
    .lower_rotate = true,
    .lower_uadd_carry = true,
    .lower_usub_borrow = true,
+   .lower_mul_2x32_64 = true,
    .lower_ifind_msb = true,
    .max_unroll_iterations = 32,
    .use_interpolated_input_intrinsics = true,