Thread Safety Analysis: rewrite SSA pass to use the new SExpr and CFG
traversal system.  The new pass is still undergoing testing; no change in
functionality.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@206338 91177308-0d34-0410-b5e6-96231b3b80d8
Format.cpp: Don't use initializer list.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@206339 91177308-0d34-0410-b5e6-96231b3b80d8
Make -Wabsolute-value C++-aware.

Warn on std::abs() with unsigned argument.
Suggest std::abs as replacement for the C absolute value functions.
Suggest C++ headers if the specific std::abs overload is not found.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@206340 91177308-0d34-0410-b5e6-96231b3b80d8