Implement ffi_returns_twice attribute

src/rustllvm/RustWrapper.cpp

@@ -190,6 +190,8 @@ static Attribute::AttrKind fromRust(LLVMRustAttribute Kind) {
     return Attribute::NonLazyBind;
   case OptimizeNone:
     return Attribute::OptimizeNone;
+  case ReturnsTwice:
+    return Attribute::ReturnsTwice;
   }
   report_fatal_error("bad AttributeKind");
 }

src/rustllvm/rustllvm.h

@@ -85,6 +85,7 @@ enum LLVMRustAttribute {
   SanitizeMemory = 22,
   NonLazyBind = 23,
   OptimizeNone = 24,
+  ReturnsTwice = 25,
 };
 
 typedef struct OpaqueRustString *RustStringRef;