[X86] PR4490 Correct -m128bit-long-double support

[Jim Wilson]

On Wed, 2003-06-04 at 14:16, Kelley Cook wrote:
> I would advocate just eliminating the user setable 
> -m{96,128}bit-long-double options and leaving the .md file the way it 
> currently is.

The options are not very useful for linux, which is stuck with a legacy
ABI.  However, they can be useful for embedded systems, which have the
choice of using different non-standard ABIs.  We already have one other
similar supported case with the -malign-double option.  The ABI changing
options can be useful for getting more performance from libraries when
the interface isn't affected by the ABI changes, but this isn't
something a naive user should try.

I don't feel strongly about making the options work, but I do think we
should fix the md file so that the feature is usable if someone wants
it.

The patch looks OK to me.

Jim