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This option causes the compiler to generate a call to a user-written __PRO
routine in the prologue sequence at the start of every function.  This
routine can be used to collect/record profiling information.  The optional
argument <number> can be used to cause the compiler to allocate that many
bytes on the stack as a place for __PRO to store information.  The macro
__SW_EP will be predefined if "ep" is selected.