[arm] Fix -fPIC

[Mark Mitchell]

Paul Brook wrote:

>The following patch fixes PIC code generation on arm. It currently fails with 
>"insn outside basic block".
>
>I've moved the PIC register initialization code from FINALIZE_PIC to the 
>function prologue. This seems to be how other targets do it. I'm guessing 
>that FINALIZE_PIC is from when we did inlining on RTL.
>
>This patch requires my previous "rework thumb function prologue" patch.
>
>Tested with cross to arm-none-elf.
>Ok?
>  
>
Yes.  I'll be glad to see all those testsuite failures go away...

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Mark Mitchell
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