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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@333937 91177308-0d34-0410-b5e6-96231b3b80d8
14 files changed