when exec stage resolve a branch instruction, it will squash the speculative
wrong path, all the branches AFTER this mispredicted branch will be squashed,
so speculative update(when lookup) should be restore according bp_history.
why tage squash function do nothing except delete bp_history, shouldn't it
first restore the global hist and path hist, then delete bp_history, just like
squash functions in bi_mode.cc or tournament.cc
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