PATCH COMMITTED: Fix testsuite failure from pointer overflow warning

[Ian Lance Taylor]

I managed to miss a testsuite failure from the pointer overflow
warning.  HP pointed it out in PR 35977.  I committed this patch to
fix it.  The test depends on an optimization which the compiler now
assumes can not be done without strict pointer overflow, and thus now
requires -O2 (or -fstrict-overflow) rather than -O1.

(The test does not actually require strict pointer overflow, and it
would be possible to continue doing the optimization at -O1, but I
think it is OK to move it to -O2.)

Ian


2008-04-18  Ian Lance Taylor  <iant@google.com>

	PR tree-optimization/35977
	* gcc.dg/tree-ssa/forwprop-3.c: Use -O2 rather than -O.


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