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[APFloat] convert SNaN to QNaN in convert() and raise Invalid signal

Authored by spatel on Oct 1 2020, 11:23 AM.

Description

[APFloat] convert SNaN to QNaN in convert() and raise Invalid signal

This is an alternate fix (see D87835) for a bug where a NaN constant
gets wrongly transformed into Infinity via truncation.
In this patch, we uniformly convert any SNaN to QNaN while raising
'invalid op'.
But we don't have a way to directly specify a 32-bit SNaN value in LLVM IR,
so those are always encoded/decoded by calling convert from/to 64-bit hex.

See D88664 for a clang fix needed to allow this change.

Differential Revision: https://reviews.llvm.org/D88238