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With statistic data of test data files of silesia the chance of position beyond highThreshold is very low (~1.3%@L8 in most cases, all <2.5%), and is in "lowprob area". Add the branch hint so compiler can get better pipiline codegen. With this change it is observed ~1% of mozilla and xml, and slight (0.3%~0.8%) but consistent uplift on other files on Arm N1. Signed-off-by: Jun He <jun.he@arm.com> Change-Id: Id9ba1d5c767e975290b5c1bf0ecce906544f4ade