peter klausler 4fb679d3b1 [flang] Fix Gw.d format output ...

The estimation of the decimal exponent needs to allow for all
'd' of the requested significant digits.

Also accept a plus sign on a "+kP" scaling factor in a format.

Differential revision: https://reviews.llvm.org/D88618

2020-09-30 18:02:25 -07:00

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