a24784ce11
This patch moves the `fltSemantics` struct definition (along with `fltNonfiniteBehavior` and `fltNanEncoding` enums) from APFloat.cpp to APFloat.h, making them part of the public API. Currently, downstream projects cannot define custom floating-point semantics because `fltSemantics` is an opaque forward declaration in the header. This forces projects with specialized float formats to either patch LLVM locally or request new formats be added upstream for each variant. By exposing the struct, downstream users can define their own semantics.
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