Issue 9655: Functions with identical bodies are allowed to be merged by compiler.

function.dd

@@ -1740,6 +1740,21 @@ void bar()
     test();
     int i = fp();       // i is set to 10
 }
+------
+
+        $(P $(B Note:) Two functions with identical bodies, or two functions
+        that compile to identical assembly code, are not guaranteed to have
+        distinct function pointer values. The compiler is free to merge
+        functions bodies into one if they compile to identical code.)
+
+------
+int abc(int x) { return x + 1; }
+int def(int y) { return y + 1; }
+
+int function() fp1 = &abc;
+int function() fp2 = &def;
+// Do not rely on fp1 and fp2 being different values; the compiler may merge
+// them.
 ------
 
         $(P A delegate can be set to a non-static nested function:)