Add internal_strchrnul function

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@189797 91177308-0d34-0410-b5e6-96231b3b80d8
[Sanitizer] Add the way to find binary in PATH

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@189799 91177308-0d34-0410-b5e6-96231b3b80d8
ASan, LSan, MSan: try to find llvm-symbolizer binary in PATH if it is not provided. Now we don't need to explicitly set the location of llvm-symbolizer in lit test configs.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@189801 91177308-0d34-0410-b5e6-96231b3b80d8
[lsan] Colorize LSan reports.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@189804 91177308-0d34-0410-b5e6-96231b3b80d8