[PATCH] Fix for LLVM debug build failure on Windows + MSVC2010SP1

[Manish Verma]

Hi,

We have recently found that the debug builds on Windows are failing when
compiled with MSVC 2010SP1. The failure message generated is the following:

f:\work\src\llvm\tools\clang\include\clang\astmatchers\astmatchersinternal.h
(266): fatal error C1128: number of sections exceeded object file format
limit : compile with /bigobj
[F:\work\build\win_32-linkMT-x86_64\cl_16.00.40219.01-vs\dbg\llvm\tools\clan
g\lib\ASTMatchers\Dynamic\clangDynamicASTMatchers.vcxproj]

A similar build failure is also reported today in
http://lists.cs.uiuc.edu/pipermail/cfe-dev/2013-June/030043.html.

Please find attached a patch which fixes the build failure and adds /bigobj
option to CXX_FLAGS for debug builds. 

One of the downside of this patch is that the debug builds of LLVM can no
longer done using Visual Studio C++ 2005 or previous versions. Otherwise, I
couldn't find any other downside of using /bigobj option.

Manish
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