predict.c (tree_predict_by_opcode): Get the probability for builtin_expect from param builtin_expect_probability.

        * predict.c (tree_predict_by_opcode): Get the probability
        for builtin_expect from param builtin_expect_probability.
        * params.def (BUILTIN_EXPECT_PROBABILITY): New parameter.
        * predict.def (PRED_BUILTIN_EXPECT_RELAXED): Fix comments.
        * doc/invoke.texi: Add documentation for builtin-expect-probability.
        * gcc.target/i386/cold-attribute-2.c: Fix the test by using original
        probability.
        * gcc.dg/tree-ssa/ipa-split-5.c: Ditto.
        * gcc.dg/tree-ssa/ipa-split-6.c: Ditto.

--This li (t)ene, and those below, will be ignored--

M    gcc/params.def
M    gcc/predict.def
M    gcc/ChangeLog
M    gcc/testsuite/gcc.dg/tree-ssa/ipa-split-5.c
M    gcc/testsuite/gcc.dg/tree-ssa/ipa-split-6.c
M    gcc/testsuite/gcc.target/i386/cold-attribute-2.c
M    gcc/predict.c
M    gcc/doc/invoke.texi

From-SVN: r203167