* desc-cpu.scm (cgen-desc.h): Don't print virtual enums.
* sid-cpu.scm (cgen-desc.h): Ditto.
* enum.scm (enum-builtin!): New function.
* read.scm (reader-install-builtin!): Call it.
* rtl-c.scm (s-convop): Delete, replaced with ...
(s-int-convop, s-float-convop): ... new fns.
(ext, zext, trunc): Update.
(fext, ftrunc, float, ufloat, fix, ufix): Update.
* rtx-funcs.scm (fext, ftrunc, float, ufloat, fix, ufix): New parameter
`how'.
* cpu/mep-fmax.cpu (fcvtsw): Update.
* cpu/sh.cpu (h-fsd, h-fmov): Update.
* doc/rtl.texi (float-convop): Update.
* frv.cpu (floating-point-conversion): Update call to fp conv op.
(floating-point-dual-conversion, ne-floating-point-dual-conversion,
conditional-floating-point-conversion, ne-floating-point-conversion,
float-parallel-mul-add-double-semantics): Ditto.
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