Revert change merged from sse2-branch. We want the assembly
code and call-out vop to be ignorant of whether we're have sse2 or not. Always do the x87 fstp/fldz stuff. compiler/x86/sse2-c-call.lisp: o Revert to vers 1.1.2.4, reinstating the fstp/fldz stuff in the callout vop. lisp/lisp.c: o Remove use of use_sse2. o Use fpu_mode_t for checking the fpu type. x86-assem.S: o Revert to ver 1.29.6.4: - Remove use of use_sse2. - Always do x87 fstp/fldz stuff whether we're using an sse2 or x87 core.
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