Fix pr23135.c on the Blackfin

[Bernd Schmidt]

This patch fixes
FAIL: gcc.c-torture/execute/pr23135.c compilation,  -O2  (internal 
compiler error)
on the Blackfin.

We abort in delete_output_reload, in the loop that compares substed 
against the contents of reg_equiv_alt_mem_list.  Code in reload.c is 
careful not to insert the normal MEM rtx for an equivalence into this 
list, but only forms that differ.  However, it uses a pointer equality 
test, and parts of find_reloads_address can copy a MEM without modifying 
it further, which causes it to be put into the list erroneously.

Fixed by just using rtx_equal_p in all instances.  Bootstrapped & 
regression tested on i686-linux; I've also verified that generated code 
is identical on a large set of input files.  Committed as 123724.


Bernd
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