Move hash_* extension headers from ext/ to Support/ so that we can support

GCC 2.95, GCC 3.0.4 and GCC 3.1 all concurrently, without having to delete
headers after a chackou.

llvm-svn: 3055

llvm/include/Support/HashExtras.h

@@ -11,7 +11,7 @@
 #define LLVM_SUPPORT_HASHEXTRAS_H
 
 #include <string>
-#include <ext/hash_map>
+#include <Support/hash_map>
 
 // Cannot specialize hash template from outside of the std namespace.
 namespace std {

llvm/include/Support/hash_map

@@ -0,0 +1,6 @@
+#if __GNUC__ == 3
+#include <ext/hash_map>
+using __gnu_cxx::hash_map;
+#else
+#include <hash_map>
+#endif

llvm/include/Support/hash_set

@@ -0,0 +1,6 @@
+#if __GNUC__==3
+#include <ext/hash_set>
+using __gnu_cxx::hash_set;
+#else
+#include <hash_set>
+#endif