Pass PICFLAGS down to cc-as-as and use __PIC__ to decide if it is small
vs big PIC mode. Retire -DPIC and -DBIGPIC.

In handwritten asm use -fPIC code instead of -fpic, our libc has grown
large enough for GOT to be larger than 8k.

While here kill redundant PIC ifdefs in setjmp.S - sparc "call"
instruction is piccy

In handwritten asm use -fPIC code instead of -fpic, our libc has grown
large enough for GOT to be larger than 8k.

While here kill redundant PIC ifdefs in setjmp.S - sparc "call"
instruction is piccy by itself.

Tested by martin@

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Switch sparc to the new compat code layout.

Make the sparc work again; some work from jason, some from me.

Change immediate label references to _C_LABEL().

Simplify.

Machine dependent sig{set,long}jmp().