[svn r340] Rework exception handling to work with nested tryfinally and trycatch.

ir/irfunction.h

@@ -2,6 +2,7 @@
 #define LLVMDC_IR_IRFUNCTION_H
 
 #include "ir/ir.h"
+#include "ir/irlandingpad.h"
 
 #include <vector>
 
@@ -25,6 +26,9 @@ struct IrFunction : IrBase
     llvm::AllocaInst* srcfileArg;
     llvm::AllocaInst* msgArg;
 
+    // landing pads for try statements
+    IRLandingPad landingPad;
+
     IrFunction(FuncDeclaration* fd);
 };