[JTS] Use common branch weight downscaling (#153738) This also fixes a bug introduced accidentally in #153651, whereby the `JumpTableToSwitch` would convert all the branch weights to 0 except for one. It didn't trip the test because `update_test_checks` wasn't run with `-check-globals`. It is now. This also made noticeable that the direct calls promoted from the indirect call inherited the `VP`metadata, which should be dropped as it makes no more sense now.
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