Fix u256 to APInt conversion

libevmjit/Type.cpp

@@ -43,9 +43,11 @@ llvm::ConstantInt* Constant::get(uint64_t _n)
 
 llvm::ConstantInt* Constant::get(u256 _n)
 {
-	auto limbs = _n.backend().limbs();
-	auto words = reinterpret_cast<uint64_t*>(limbs);
-	llvm::APInt n(256, 4, words);
+	auto& backend = _n.backend();
+	auto words = reinterpret_cast<uint64_t*>(backend.limbs());
+	auto nWords = backend.limb_bits == 64 ? backend.size() : (backend.size() + 1) / 2;
+	llvm::APInt n(256, nWords, words);
+	assert(n.toString(10, false) == _n.str());
 	return static_cast<llvm::ConstantInt*>(llvm::ConstantInt::get(Type::i256, n));
 }