Reapply r334980 and r334983.

These patches were previously reverted as they led to 
buildbot time-outs caused by large switch statement in
printAliasInstr when using UBSan and O3.  The issue has
been addressed with a workaround (r335525).

llvm-svn: 336079
48 files changed
tree: 040e68206e22ab034e9965a73e4f11b7c1797826
  1. clang/
  2. clang-tools-extra/
  3. compiler-rt/
  4. debuginfo-tests/
  5. libclc/
  6. libcxx/
  7. libcxxabi/
  8. libunwind/
  9. lld/
  10. lldb/
  11. llgo/
  12. llvm/
  13. openmp/
  14. parallel-libs/
  15. polly/
  16. README.md
README.md

Low Level Virtual Machine (LLVM)

This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.