Cross-compilation doc

llvm-svn: 190282
diff --git a/llvm/docs/index.rst b/llvm/docs/index.rst
index 4bf86a2..af54fdd 100644
--- a/llvm/docs/index.rst
+++ b/llvm/docs/index.rst
@@ -66,6 +66,7 @@
 
    CMake
    HowToBuildOnARM
+   HowToCrossCompileLLVM
    CommandGuide/index
    GettingStarted
    GettingStartedVS
@@ -95,6 +96,9 @@
 :doc:`HowToBuildOnARM`
    Notes on building and testing LLVM/Clang on ARM.
 
+:doc:`HowToCrossCompileLLVM`
+   Notes on cross-building and testing LLVM/Clang.
+
 :doc:`GettingStartedVS`
    An addendum to the main Getting Started guide for those using Visual Studio
    on Windows.