patch for 3.4 ice on arm-linux with -frename-registers

[Philip Blundell]

gcc 3.4 blows up with "insn doesn't satisfy its constraints" when
compiling http://handhelds.org/~pb/pre-modify-ice.i.gz with -O2
-frename-registers.  The problem seems to be that although the register
expressions in the two parts of the PRE_MODIFY have the same contents,
they are not the same rtx and so comparing the pointers directly fails.

p.

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