Rebased localmods in libcxx to 223109.

.gitignore

Index: .gitignore
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..2f0da84de607a44dd93cbdb0e79fb44373506894
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,25 @@
+#==============================================================================#
+# This file specifies intentionally untracked files that git should ignore.
+# See: http://www.kernel.org/pub/software/scm/git/docs/gitignore.html
+#
+# This file is intentionally different from the output of `git svn show-ignore`,
+# as most of those are useless.
+#==============================================================================#
+
+#==============================================================================#
+# File extensions to be ignored anywhere in the tree.
+#==============================================================================#
+# Temp files created by most text editors.
+*~
+# Merge files created by git.
+*.orig
+# Byte compiled python modules.
+*.pyc
+# vim swap files
+.*.swp
+.sw?
+
+#==============================================================================#
+# Explicit files to ignore (only matches one).
+#==============================================================================#
+.gitusers