ASTDumper: fix dump of CXXCatchStmt

Summary: I added the display of the VarDecl contained in the statement.

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D1596
Use CHECK-DAG instead of sort.
[asan] add a test that demonstrates why the current use-after-return is not signal-safe
Rename in preparation for adding tests for function linking.
Fix linking of unnamed_addr in functions.
Added documentation for clang-format style options.

Summary:
The main contents is in the ClangFormatStyleOptions.rst, which can be
updated from the Format.h by the dump_format_style.py script.

Reviewers: djasper, klimek

Reviewed By: klimek

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D1597
A minor fix in the documentation.
[Sparc] Fix an assertion failure while lowering fcmp on long double.
  This assertion is triggered because an integer constant is created with wrong
  type.
Evgeniy Stepanov: Add noexcept to ~bad_optional_access() to silence warning during build.
Error on linking appending globals with different unnamed_addr.
More unused warning silencing.
Move generic isPrint and columnWidth implementations to a separate header/source to allow using both generic and system-dependent versions on win32.

Summary:
This is needed so we can use generic columnWidthUTF8 in clang-format on
win32 simultaneously with a separate system-dependent implementations of
isPrint/columnWidth in TextDiagnostic.cpp to avoid attempts to print Unicode
characters using narrow-character interfaces (which is not supported on Windows,
and we'll have to figure out how to handle this).

Reviewers: jordan_rose

Reviewed By: jordan_rose

CC: llvm-commits, klimek

Differential Revision: http://llvm-reviews.chandlerc.com/D1559
Fixing a problem with inferior exit caused by signal
Revert "Add r159136 back now that pr13124 has been fixed."

This reverts commit r189886.

I found a corner case where this optimization is not valid:

Say we have a "linkonce_odr unnamed_addr" in two translation units:
* In TU 1 this optimization kicks in and makes it hidden.
* In TU 2 it gets const merged with a constant that is *not* unnamed_addr,
  resulting in a non unnamed_addr constant with default visibility.
* The static linker rules for combining visibility them produce a hidden
  symbol, which is incorrect from the point of view of the non unnamed_addr
  constant.

The one place we can do this is when we know that the symbol is not used from
another TU in the same shared object, i.e., during LTO. I will move it there.
Adds a VSPackage project that builds a VS extension to run clang-format over a selection / the line at the cursor.
ObjectiveC migrator. Refactor last patch on
annotations. (was r189892).
Revert svn 189837 "Added header dependencies support."

The NoProblemsDependencies.modularize test is failing on many buildbots.
I have also reverted the change in 189904 to disable that test for MSVC.
Fix scheduling for vldm/vstm instructions that load/store more than 32 bytes on Cortex-A9. This also makes the existing code more compact.
Added a "sources.py" which adds a command that can print out the source files contained in one or more modules.

Added "mach_o.py" which is a mach-o parser that can dump mach-o file contents and also extract sections. It uses the "file_extract" module and the "dict_utils" module.
Rename cpp11-migrate to clang-modernize.

There is no reason to expect this tool to be limited to C++11, it seems
very likely to be of on-going interest. It seems likely to be useful for
modernizing even as new libraries come out in TSes and other formats
than a complete standard. Fundamentally, we need something a bit more
general. After some discussion on the list, going with
'clang-modernize'.

I've tried to do a reasonably comprehensive job of fixing up the names,
but I may still have missed some. Feel free to poke me if you spot any
fallout here. Things I've tried reasonably hard to find and fix:

- cpp11-migrate -> clang-modernize
- Migrator -> Modernizer
- Clean up the introductory documentation that was C++11 specific.

I'll also point out that this tool continues to delight me. =] Also,
a huge thanks to those who have so carefully, thoroughly documented the
tool. The docs here are simply phenomenal. Every tool should be this
well documented. I hope I have updated the documentation reasonably
well, but I'm not very good at documentation, so review much
appreciated.