A completely different approach to EH runtime

[Richard Kenner]

    Let me repeat. Any solution for Linux has to be worked out between
    glibc and gcc, not by gcc alone.

How can there *possibly* be any interaction between glibc and gcc?  The vast
majority of systems on which GCC is run don't even *use* glibc.

The routines in libgcc are meant to be called *only* by calls inserted
by GCC.  Any other usage is incorrect and should be fixed.