target/8087: sparc-sun-solaris2.7 C testsuite failures in execute/20020720-1.c w/-m64 or on sparcv9/sparc64

[Roger Sayle]

>    Just to let you know, I'm still investigating a solution.
>
> Ok.  I would prefer if a seperate PR is opened for the REG_EQUAL
> problem, since that is a generic compiler issue actually.

The REG_EQUAL notes is a separate issue.  The fixes that I'm still
investigating address the sparc64 backend's convoluted constant
pool loading code.

Roger
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