Add gitignore entries for MSVS files

BUG=none
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/19500011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15779 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

.gitignore

@@ -9,11 +9,14 @@
 *.pdb
 *.pyc
 *.scons*
+*.sdf
 *.sln
 *.so
 *.suo
 *.user
 *.vcproj
+*.vcxproj
+*.vcxproj.filters
 *.xcodeproj
 #*#
 *~
@@ -26,6 +29,7 @@ shell
 shell_g
 /build/Debug
 /build/gyp
+/build/ipch/
 /build/Release
 /obj
 /out