Define ET_HAS_EXCEPTIONS macro (#11664)

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@diff-train-skip-merge

Co-authored-by: Scott Wolchok <[email protected]>

Author: pytorchbot

runtime/platform/compiler.h

@@ -171,6 +171,14 @@
 using ssize_t = ptrdiff_t;
 #endif
 
+#ifdef __EXCEPTIONS
+#define ET_HAS_EXCEPTIONS 1
+#elif defined(_HAS_EXCEPTIONS) && _HAS_EXCEPTIONS
+#define ET_HAS_EXCEPTIONS 1
+#else
+#define ET_HAS_EXCEPTIONS 0
+#endif
+
 // DEPRECATED: Use the non-underscore-prefixed versions instead.
 // TODO(T199005537): Remove these once all users have stopped using them.
 #define __ET_DEPRECATED ET_DEPRECATED