Add header search paths for Mingw32 (GCC version 4).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@55830 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/InitHeaderSearch.cpp b/lib/Driver/InitHeaderSearch.cpp
index ccfea31..85d44a9 100644
--- a/lib/Driver/InitHeaderSearch.cpp
+++ b/lib/Driver/InitHeaderSearch.cpp
@@ -144,6 +144,11 @@
 
     // DragonFly
     AddPath("/usr/include/c++/4.1", System, true, false, false);
+
+    // Mingw32 GCC version 4
+    AddPath("c:/mingw/lib/gcc/mingw32/4.3.0/include/c++", System, true, false, false);
+    AddPath("c:/mingw/lib/gcc/mingw32/4.3.0/include/c++/mingw32", System, true, false, false);
+    AddPath("c:/mingw/lib/gcc/mingw32/4.3.0/include/c++/backward", System, true, false, false);
   }
 
   AddPath("/usr/local/include", System, false, false, false);
@@ -212,6 +217,10 @@
   // DragonFly
   AddPath("/usr/libdata/gcc41", System, true, false, false);
 
+  // Mingw32 GCC version 4
+  AddPath("C:/mingw/lib/gcc/mingw32/4.3.0/include", System, false, false, false);
+  AddPath("C:/mingw/include", System, false, false, false);
+
   AddPath("/usr/include", System, false, false, false);
   AddPath("/System/Library/Frameworks", System, true, false, true);
   AddPath("/Library/Frameworks", System, true, false, true);