Silence macos conversion warnings (rust-lang#374)

Author: wsmoses

enzyme/Enzyme/CApi.cpp

@@ -376,11 +376,11 @@ LLVMValueRef EnzymeCreatePrimalAndGradient(
           .retType = (DIFFE_TYPE)retType,
           .constant_args = nconstant_args,
           .uncacheable_args = uncacheable_args,
-          .returnUsed = returnValue,
-          .shadowReturnUsed = dretUsed,
+          .returnUsed = (bool)returnValue,
+          .shadowReturnUsed = (bool)dretUsed,
           .mode = (DerivativeMode)mode,
           .freeMemory = true,
-          .AtomicAdd = AtomicAdd,
+          .AtomicAdd = (bool)AtomicAdd,
           .additionalType = unwrap(additionalArg),
           .typeInfo = eunwrap(typeInfo, cast<Function>(unwrap(todiff))),
       },