Enabling LLVM & Clang to be cross-compiled using CMake from a single configuration command line

The basic idea is similar to the existing cross compilation support. A directory must be configured to build host versions of tablegen tools and llvm-config. This directory can be user provided (and configured), or it can be created during the build. During a build the native build directory will be configured and built to supply the tablegen tools used during the build. A user could also explicitly provide the tablegen executables to run on the CMake command line.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217105 91177308-0d34-0410-b5e6-96231b3b80d8
[asan] fix debug info produced for asan-coverage=2

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217106 91177308-0d34-0410-b5e6-96231b3b80d8
Don't treat 0 as a special value for int attributes.

Split the get() to not use a default value. This way
attributes can be added that have 0 as a legitimate value.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217107 91177308-0d34-0410-b5e6-96231b3b80d8
R600/SI: Try to keep i32 mul on SALU

Also fix bug this exposed where when legalizing an immediate
operand, a v_mov_b32 would be created with a VSrc dest register.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217108 91177308-0d34-0410-b5e6-96231b3b80d8
R600/SI: Un-move pattern I forgot to remove in last commit

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217109 91177308-0d34-0410-b5e6-96231b3b80d8
Revert accidentally committed r217107

"Don't treat 0 as a special value for int attributes."

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217110 91177308-0d34-0410-b5e6-96231b3b80d8
llvm-cov: Don't pointlessly create a unique_ptr (NFC)

There's no ownership going on here, and no reason to heap allocate
this object.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217113 91177308-0d34-0410-b5e6-96231b3b80d8