Let TargetABI::passByValue() know when a parameter is byref (either explicitly or because it's a static array) by giving it the pointer type instead of the type itself. This fixes Derelict compilation on x86-64, where the ABI wasn't expecting a static array to be passed in at all.

// D runtime support helpers

bool LLVM_D_InitRuntime();
void LLVM_D_FreeRuntime();

llvm::Function* LLVM_D_GetRuntimeFunction(llvm::Module* target, const char* name);

llvm::GlobalVariable* LLVM_D_GetRuntimeGlobal(llvm::Module* target, const char* name);