pipeline: fix multiple SWX emit pattern detection

pipeline: fix multiple SWX emit pattern detection

Fix the detection of instruction pattern with multiple emits followed
by TX. Once detected, this is one of the instruction patterns that is
internally replaced with a single optimized instruction, as long as
none of the instructions to be replaced is referenced by a jump
instruction. The fix enforces this check for the TX instruction of
the pattern.

Fixes: 31035e87b207 ("pipeline: add SWX instruction optimizer")
Signed-off-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>