[committed] Move non-PIC jump table to rodata on 32-bit linux

[John David Anglin <dave dot anglin at bell dot net>]

The attached patch fixes a problem noted by Helge Deller.  When a 
non-PIC jump table is
placed in the text section, the local label marking the head of the 
table ends up in the
unwind data.  This is due to the R_PARISC_DIR21L and R_PARISC_DIR14R 
relocations needed
to load the address of the table.  This breaks the unwind data.

On the 32-bit Linux target, we can simply put non-PIC jump tables in 
rodata.  This has the
added benefit that it shortens the text section and avoids potential 
issues in calculating
branch distances.

We should also do this for the HP-UX SOM target.  However, this requires 
deferring the output
of branch tables to final.

When generating PIC code, the references are relative and the label is 
removed by the assembler.

Tested change on hppa-unknown-linux-gnu.  Committed change to active 
branches.

Dave

--
John David Anglin  dave.anglin@bell.net

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