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Avoid overflow in fe_utils' printTable()

Avoid overflow in fe_utils' printTable()

The original code would miscalculate the total number of cells when the
table to print has more than ~4 billion cells, leading to an unnecessary
error. Repair by changing some computations to be 64-bits wide. Add
some necessary overflow checks.

Author: Hongxu Ma <interma@outlook.com>
Discussion: https://postgr.es/m/TYBP286MB0351B057B101C90D7C1239E6B4E2A@TYBP286MB0351.JPNP286.PROD.OUTLOOK.COM

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