[hpux] Update prologue analysis insn pattern

[Randolph Chung]

through experimentation I have found another insn pattern used for 
storing rp onto the stack that is used at least on hpux11.11. Add it to 
the prologue analysis code.

this is a good example of why Joel's proposal of cleaning up and 
considating the prologue analysis code is a good idea :)

committed.
randolph
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