[cmucl] #89: Follow C99 for the value of the special functions at exception arguments

#89: Follow C99 for the value of the special functions at exception arguments --------------------+------------------------------------------------------- Reporter: rtoy | Owner: somebody Type: defect | Status: new Priority: minor | Milestone: Component: Core | Version: 20e Keywords: | --------------------+------------------------------------------------------- The CLHS doesn't say anything for value of the special functions for exceptional arguments like infinity (signed) or NaN. Since CMUCL supports IEEE-754, we should follow the C99 specification when it does not conflict with the CLHS.