Clean up the FP stack before returning.  The i387 exp() leaked an FP register on its first call.  Subsequent calls reused the register so the leak didn't accumulate.  Fixes PR 1275.
Clean up the FP stack before returning.  The i387 exp() leaked an FP
register on its first call.  Subsequent calls reused the register so
the leak didn't accumulate.  Fixes PR 1275.

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