Upgrade to LLVM-2.9. Thanks to David Nadlinger for the patch.

gen/main.cpp

@@ -7,7 +7,6 @@
 #include "llvm/LinkAllVMCore.h"
 #include "llvm/Linker.h"
 #include "llvm/LLVMContext.h"
-#include "llvm/System/Signals.h"
 #include "llvm/Target/SubtargetFeature.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetOptions.h"
@@ -160,15 +159,6 @@ int main(int argc, char** argv)
     VersionCondition::addPredefinedGlobalIdent("D_Version2");
 #endif
 
-    // merge DFLAGS environment variable into argc/argv
-    getenv_setargv("DFLAGS", &argc, &argv);
-#if 0
-    for (int i = 0; i < argc; i++)
-    {
-    printf("argv[%d] = '%s'\n", i, argv[i]);
-    }
-#endif
-
     // build complete fixed up list of command line arguments
     std::vector<const char*> final_args;
     final_args.reserve(argc);