[PATCH] .gitignore: add some rules to clarify 'arc diff'

[Ramkumar Ramachandra]

Hi ddunbar, Bigcheese,

Often, we miss committing new files, and 'arc diff' is supposed to warn
us about this. Unfortunately, because of the massive output of the
command (so many untracked files not in .gitignore), we tend to ignore
it and lose information. Fix this by adding some rules: works if the
build directory is /build.

http://reviews.llvm.org/D6869

Files:
  .gitignore

Index: .gitignore
===================================================================
--- .gitignore
+++ .gitignore
@@ -24,6 +24,13 @@
 #==============================================================================#
 # Explicit files to ignore (only matches one).
 #==============================================================================#
+# Various tag programs
+/tags
+/TAGS
+/GPATH
+/GRTAGS
+/GSYMS
+/GTAGS
 .gitusers
 autom4te.cache
 cscope.files
@@ -35,6 +42,8 @@
 #==============================================================================#
 # Directories to ignore (do not add trailing '/'s, they skip symlinks).
 #==============================================================================#
+# LLVM build tree, by convention
+/build
 # External projects that are tracked independently.
 projects/*
 !projects/CMakeLists.txt

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