Add ipch folders and debug.txt to .gitignore.

TRAC #22441

Signed-off-by: Geoff Lang
Signed-off-by: Daniel Koch
Author: Jamie Madill

git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@1756 736b8ea6-26fd-11df-bfd4-992fa37f6226

.gitignore

@@ -7,3 +7,6 @@ Release
 *.vcxproj.user
 patches-*
 *.target.mk
+ipch
+debug.txt
+