Peter Klausler 0e05ab6745 [flang] Fix interpretations of x87 80-bit Inf/NaN ...

Current implementations of x87 80-bit extended precision floating
point interpret 7FFF8000000000000000 as +Inf, not a Nan.  The explicit
MSB in the significand must be set for an infinity.

Differential Revision: https://reviews.llvm.org/D151739

2023-05-31 09:22:17 -07:00

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