add gentoo stable gcc headers path so that all tests pass here (CPATH isnt enough..)

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@53143 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Driver/clang.cpp b/Driver/clang.cpp
index 0c6f30e..6efab74 100644
--- a/Driver/clang.cpp
+++ b/Driver/clang.cpp
@@ -1051,6 +1051,10 @@
     AddPath("/usr/lib/gcc/powerpc-linux-gnu/4.2.3/include", System,
             false, false, false, Headers);
 
+    // Gentoo x86 stable
+    AddPath("/usr/lib/gcc/i686-pc-linux-gnu/4.1.2/include", System,
+            false, false, false, Headers);
+
     AddPath("/usr/include", System, false, false, false, Headers);
     AddPath("/System/Library/Frameworks", System, true, false, true, Headers);
     AddPath("/Library/Frameworks", System, true, false, true, Headers);