Reapply Logging: make os_log buffer size an integer constant expression.
The size of an os_log buffer is known at any stage of compilation, so making it
a constant expression means that the common idiom of declaring a buffer for it
won't result in a VLA. That allows the compiler to skip saving and restoring
the stack pointer around such buffers.
This also moves the OSLog and other FormatString helpers from
libclangAnalysis to libclangAST to avoid a circular dependency.
git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@345971 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed
