(FIXED_REGNO_P): Remove previous change; all callers but one already check.
(CHEAP_REG): Only call FIXED_REGNO_P for hard regs. (fold_rtx): Clarify comments. From-SVN: r3762
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(CHEAP_REG): Only call FIXED_REGNO_P for hard regs. (fold_rtx): Clarify comments. From-SVN: r3762