Be aware of (x86_64-redhat-linux6E-)g++44 on RHEL5.

AFAIK, RHEL5 (and its clones) provides g++44 as the package "gcc44-c++".
By default, g++-4.1.1 is available, though, its libstdc++ would not be suitable to clang++.

llvm-svn: 133156
diff --git a/clang/lib/Driver/ToolChains.cpp b/clang/lib/Driver/ToolChains.cpp
index 35e7d80..53ef722 100644
--- a/clang/lib/Driver/ToolChains.cpp
+++ b/clang/lib/Driver/ToolChains.cpp
@@ -1516,6 +1516,9 @@
     else if (!llvm::sys::fs::exists("/usr/lib/gcc/x86_64-pc-linux-gnu",
              Exists) && Exists)
       GccTriple = "x86_64-pc-linux-gnu";
+    else if (!llvm::sys::fs::exists("/usr/lib/gcc/x86_64-redhat-linux6E",
+             Exists) && Exists)
+      GccTriple = "x86_64-redhat-linux6E";
     else if (!llvm::sys::fs::exists("/usr/lib/gcc/x86_64-redhat-linux",
              Exists) && Exists)
       GccTriple = "x86_64-redhat-linux";