Revert of V2 of //tools/binary_size rewrite (diffs).

tools/binary_size/testdata/Map2Size.golden

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-+ Without 2 merge sections and 0 anonymous entries (accounting for 2641042 bytes):
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-Section t has 0.2% of 68122 bytes accounted for from 12 symbols. 35832590 bytes are unaccounted for. Padding accounts for -6280 bytes
-+ Without 2 merge sections and 0 anonymous entries (accounting for 67338 bytes):
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