target/hexagon: fix J2_jumptnew/pt predicate check to use LSB

J2_jumptnew and J2_jumptnewpt passed the raw predicate value to gen_cond_jump(), checking if the full 8-bit value was non-zero. Refer to PRM Section 6.1.2 "predicate-consuming instructions examine only the least-significant bit". This inconsistency caused if (p0.new) jumps and if (p0.new) loads within the same packet to disagree when the predicate had values other than the ones generated by predicate-generating instructions (e.g. 0x80 or 0xAA where bit 0 is clear but the value is non-zero): the jump would be taken while the loads were skipped. Fix by routing both macros through fGEN_TCG_cond_jumpt(fLSBNEW(PuN)), matching the pattern used by every other predicated jump. Discovered-by: Alexey Karyakin <akaryaki@qti.qualcomm.com> Reviewed-by: Taylor Simpson <ltaylorsimpson@gmail.com> Signed-off-by: Brian Cain <brian.cain@oss.qualcomm.com>