[PATCH] LangRef: add a note about the mangling-suppressing \01 prefix

[Hans Wennborg]

Hi rnk,

Someone asked about this on IRC the other day, and I couldn't find the magic prefix documented anywhere.

http://reviews.llvm.org/D4728

Files:
  docs/LangRef.rst

Index: docs/LangRef.rst
===================================================================
--- docs/LangRef.rst
+++ docs/LangRef.rst
@@ -79,7 +79,8 @@
    characters in their names can be surrounded with quotes. Special
    characters may be escaped using ``"\xx"`` where ``xx`` is the ASCII
    code for the character in hexadecimal. In this way, any character can
-   be used in a name value, even quotes themselves.
+   be used in a name value, even quotes themselves. The ``"\01"`` prefix
+   can be used on global variables to suppress mangling.
 #. Unnamed values are represented as an unsigned numeric value with
    their prefix. For example, ``%12``, ``@2``, ``%44``.
 #. Constants, which are described in the section  Constants_ below.
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