Make unreferenced f-group options anonymous

These were showing up with find-unused-options.sh

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@199560 91177308-0d34-0410-b5e6-96231b3b80d8
docs: clarify the role of compiler-builtin type trait primitives

Update the documentation to clarify the intent of clang's built-in type trait
facilities, their relation to user-facing C++ type traits and means to check
for availability.

Also explain that __has_feature() is not currently up to date and should not
generally be used in user code (there's a proposal to provide more consistent
checks via __has_builtin(), see cfe-dev).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@199562 91177308-0d34-0410-b5e6-96231b3b80d8
Fix comment typos

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@199563 91177308-0d34-0410-b5e6-96231b3b80d8
Harden InitListExpr::isStringLiteralInit() against getInit() returning null.

This led to a crash on invalid code (sorry, no good test case).

Fixes <rdar://problem/15831804>.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@199571 91177308-0d34-0410-b5e6-96231b3b80d8
clang-format: Fix ObjC block as first call parameter formatting.

Before:
  foo (^{ bar(); });
After:
  foo(^{ bar(); });

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@199573 91177308-0d34-0410-b5e6-96231b3b80d8
[CMake] check-clang requires clang-tblgen. It is not required by anyone when external CLANG_TABLEGEN is specified.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@199579 91177308-0d34-0410-b5e6-96231b3b80d8
clang-format: Better support and testing for protocol buffers.

With this patch, there is dedicated testing for protocol buffers
(https://developers.google.com/protocol-buffers/).

Also some minor tweaks formatting tweaks.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@199580 91177308-0d34-0410-b5e6-96231b3b80d8
[CMake] Prune LLVM_TOOLS_DIR and LLVM_LIBS_DIR in clang/test/CMakeLists.txt. They are overridden in configure_lit_site_cfg().

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@199591 91177308-0d34-0410-b5e6-96231b3b80d8