[committed] Fix PR tree-opt/22269

[Andrew Pinski]

The problem here is that we are not checking the correct operand if it
was a SSA_NAME.  This patch fixes the problem.  I committed it as 
obvious
after a bootstrap and test on powerpc-darwin.

ChangeLog:
	* tree-ssa-reassoc.c (should_transpose): Fix which operand
	we check for SSA_NAME for.

testsuite/ChangeLog:
	* gcc.c-torture/compile/pr22269.c: New test.

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