Sync with spike version of softfloat #26
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Addresses #24
It adds the following modifications of softfloat version 3d from Spike:
As far as I can tell all of these were added for the RISC-V vector extension.
Any modifications related to the build system in Spike were left out.
As I'm just a user and by no means a softfloat expert, I would appreciate some advice on these things before merging:
specialization.hwere specific to RISC-V. What would be the quickest way of optaining the special values for ARM and 8086? Then I'll adjust them from the RISC-V vaues which I currently just copied.