Add support for Win64 stack unwind data as STACK CFI

This is a copy of https://breakpad.appspot.com/1264002/ where code review took place.

See https://bugzilla.mozilla.org/show_bug.cgi?id=548035 and https://code.google.com/p/chromium/issues/detail?id=115922

Credit to Mikhail I. Izmestev <izmmishao5@gmail.com> for original patch in https://breakpad.appspot.com/345002/

BUG=572
TEST=Run dump_syms_unittest after compiling dump_syms_regtest.cc with x64 toolchain
R=mark@chromium.org

Review URL: https://breakpad.appspot.com/1274002

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1290 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/tools/windows/dump_syms/dump_syms.gyp

@@ -52,6 +52,13 @@
         '<(DEPTH)/client/windows/unittests/testing.gyp:gtest',
         'dump_syms',
       ],
+      'msvs_settings': {
+        'VCLinkerTool': {
+          'AdditionalDependencies': [
+            'shell32.lib',
+          ],
+        },
+      },
     },
   ],
 }

src/tools/windows/dump_syms/dump_syms_unittest.cc

@@ -57,6 +57,8 @@ const wchar_t* kRootNames[] = {
   L"omap_stretched",
   // A PDB file with OMAP data for an image that has been basic block reordered.
   L"omap_reorder_bbs",  
+  // A 64bit PDB file with no OMAP data.
+  L"dump_syms_regtest64",
 };
 
 void TrimLastComponent(const std::wstring& path,