Use Windows' C++ exception handler.

We don't emit any funclets in our code, but there should be a funclet for the
exception in the native C++ function `throw_breakpoint` in object_loader.hh.

lib/llvm-backend/src/code.rs

@@ -4503,7 +4503,8 @@ impl ModuleCodeGenerator<LLVMFunctionCodeGenerator, LLVMBackend, CodegenError>
         let intrinsics = Intrinsics::declare(&module, &context);
 
         let personality_func = module.add_function(
-            "__gxx_personality_v0",
+            // "__gxx_personality_v0",
+            "__CxxFrameHandler3",
             intrinsics.i32_ty.fn_type(&[], false),
             Some(Linkage::External),
         );