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PR tree-optimization/51877 * tree-ssa-tail-merge.c (gimple_equal_p): Don't return true whenever call arguments and fndecls compare equal, instead return false if they don't. Return true only if lhs1 and lhs2 are either both NULL, or both SSA_NAMEs that are valueized the same, or they satisfy operand_equal_p. * gcc.c-torture/execute/pr51877.c: New test. From-SVN: r183237
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