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In thin and full LTO + CFI, direct function calls may go through jump table

Description

In thin and full LTO + CFI, direct function calls may go through jump table
entries to reach the target. Since these calls don't require type checks,
we can short-circuit them to their real targets, except in cases when they
can be pre-empted.

Differential Revision: https://reviews.llvm.org/D46326