[committed] Consolidate various PIC pc-relative sequences to one output function in pa.c

[John David Anglin]

The attached patch consolidates various PIC pc-relative sequences to load function and code-label
addresses into one function.  This simplifies the output functions.  It also allows use of the mfia instruction
to load the current program counter when generating PA 2.0 .

These sequences are primarily used for long PIC calls.

Tested on hppa-unknown-linux-gnu, hppa64-hp-hpux11.11 and hppa2.0w-hp-hpux11.11 using
BOOT_CFLAGS and BOOT_CCCFLAGS for long call generation.

Committed to trunk.

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


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