Update to work with LLVM 2.7.

Removed use of dyn_cast, llvm no compiles
without exceptions and rtti by
default. We do need exceptions for the libconfig stuff, but rtti isn't
necessary (anymore).

Debug info needs to be rewritten, as in LLVM 2.7 the format has
completely changed. To have something to look at while rewriting, the
old code has been wrapped inside #ifndef DISABLE_DEBUG_INFO , this means
that you have to define this to compile at the moment.

Updated tango 0.99.9 patch to include updated EH runtime code, which is
needed for LLVM 2.7 as well.

gen/todebug.cpp

@@ -19,6 +19,8 @@
 
 using namespace llvm::dwarf;
 
+#ifndef DISABLE_DEBUG_INFO
+
 #define DBG_NULL    ( LLConstant::getNullValue(DBG_TYPE) )
 #define DBG_TYPE    ( getPtrToType(llvm::StructType::get(gIR->context(),NULL,NULL)) )
 #define DBG_CAST(X) ( llvm::ConstantExpr::getBitCast(X, DBG_TYPE) )
@@ -220,7 +222,7 @@ static void add_base_fields(
     }
 }
 
-//FIXME: This does not use llvm's DIFactory as it can't 
+//FIXME: This does not use llvm's DIFactory as it can't
 //   handle recursive types properly.
 static llvm::DICompositeType dwarfCompositeType(Type* type, llvm::DICompileUnit compileUnit)
 {
@@ -530,7 +532,7 @@ llvm::DICompileUnit DtoDwarfCompileUnit(Module* m)
         false, // isMain,
         false // isOptimized
     );
-    
+
     // if the linkage stays internal, we can't llvm-link the generated modules together:
     // llvm's DwarfWriter uses path and filename to determine the symbol name and we'd
     // end up with duplicate symbols
@@ -636,3 +638,5 @@ void DtoDwarfStopPoint(unsigned ln)
         gIR->scopebb()
     );
 }
+
+#endif