[PATCH] Display all the target switches for SH compiler's '--target-help' option

[Joern Rennecke]

> !   {"fmovd",   FMOVD_BIT, "Enable instruction fmovd" },                \
Hold off on this one.  There is a problem with the architecture
specification.  We'll get back to you on this in a couple of days.

> !   {"isize",   ISIZE_BIT, "Dump instruction size and location in the assembly code" },         \
This option is used to debug gcc internals.  The output format might change.
For this reason, I'm not sure if we really should document this user-visibly;
and if we do, should we put a warning there?

> !   {"space",   SPACE_BIT, "Optimize for space instead of speed" },             \
This option is only retained for backwards compatibility with old
makefiles.  I think we should use a text like:
"Deprecated.  Use -Os instead"

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