Fix fmtlib build error (#51)

Summary:
Added a log for BinaryOpKind but there's no format implementation for it yet.

Pull Request resolved: #51

Test Plan: Built locally in OSS, it worked.

Reviewed By: yoney

Differential Revision: D103865152

Pulled By: alexmalyshev

fbshipit-source-id: 9f93759109b4c39313ebe1d8ee5d516086a85089

Author: alexmalyshev

cinderx/Jit/hir/hir.h

@@ -547,6 +547,10 @@ enum class BinaryOpKind {
 #undef DEFINE_OP
 };
 
+inline auto format_as(BinaryOpKind kind) {
+  return fmt::underlying(kind);
+}
+
 #define COUNT_OP(NAME) +1
 constexpr size_t kNumBinaryOpKinds = FOREACH_BINARY_OP_KIND(COUNT_OP);
 #undef COUNT_OP