because on alpha:
#   define errno (*__errno_location ())

*shakes head


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22383 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/BasicAliasAnalysis.cpp b/lib/Analysis/BasicAliasAnalysis.cpp
index 1110a01..3c0f0f6 100644
--- a/lib/Analysis/BasicAliasAnalysis.cpp
+++ b/lib/Analysis/BasicAliasAnalysis.cpp
@@ -743,6 +743,7 @@
   // glibc functions:
   "__fpclassify", "__fpclassifyf", "__fpclassifyl",
   "__signbit", "__signbitf", "__signbitl",
+  "__errno_location",
 };
 
 static const unsigned DAMTableSize =