Changed the handling of variadic intrinsics a bit.

Removed the -fp80 option and made real be 80bit floats on X86, this is what the D spec really says it should be and fixes a bunch of issues.
Changed the handling of parameter attributes to a bit more generalized approach.
Added sext/zext attributes for byte/short/ubyte/ushort parameters, fixes #60 .
Parameter attribs now properly set for intrinsic calls if necessary.
Made the tango.math.Math patch less intrusive.
Fixed/added some mini tests.

gen/llvm.h

@@ -10,6 +10,7 @@
 #include "llvm/Function.h"
 #include "llvm/Module.h"
 #include "llvm/Value.h"
+#include "llvm/ParameterAttributes.h"
 
 #include "llvm/Target/TargetData.h"
 
@@ -37,9 +38,12 @@ using llvm::IRBuilder;
 #define LLConstantStruct llvm::ConstantStruct
 #define LLConstantArray llvm::ConstantArray
 #define LLConstantInt llvm::ConstantInt
+#define LLConstantFP llvm::ConstantFP
 
 #define LLPATypeHolder llvm::PATypeHolder
 
 #define LLSmallVector llvm::SmallVector
 
+#define APFloat llvm::APFloat
+
 #endif // GEN_LLVM_H