Update aosp/master clang for rebase to r256229

http://b/26987366

Change-Id: I5d349c9843ea5c24d6e455956f8a446393b6873d
diff --git a/docs/index.rst b/docs/index.rst
index dec2bc8..a0a70c0 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -24,6 +24,7 @@
    AddressSanitizer
    ThreadSanitizer
    MemorySanitizer
+   UndefinedBehaviorSanitizer
    DataFlowSanitizer
    LeakSanitizer
    SanitizerCoverage
@@ -32,6 +33,7 @@
    SafeStack
    Modules
    MSVCCompatibility
+   CommandGuide/index
    FAQ
 
 Using Clang as a Library