[Bug 908508]

[Landry-openbsd]

Created attachment 619876
Use YARR interpreter instead of PCRE on platforms where YARR JIT is not supported

Fwiw here's the (simpler) patch i'm working on (no, i didn't gave up..) :
- it doesnt touch the ENABLE_ASSEMBLER hell -> shouldnt affect tier1 archs
- it uses the dummy empty cacheFlush implem for PPC in ExecutableAllocator.h
- adds ExecutableAllocator.cpp/ExecutableAllocatorPosix.cpp to CPPSRCS in !YARR_JIT case (i didnt do the ifdef WIN/OS2 dance, as i doubt win/os2 might fall in the !YARR_JIT case someday.. prove me wrong :)
- inconditionally includes ExecutableAllocator.h in wtfbridge.h so that the definition of ExecutableAllocator class is available everywhere

It currently builds a working shell on ppc (regress tests passes except
testConservativeGC but that seems related to #750620), i've yet to
confirm it produces a working firefox. I'll also see if it fixes the
build on sparc64, and then i'll send it to try to see if it breaks
anything else.

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Title:
  Firefox/Thunderbird 10 FTBFS on powerpc in js/src/yarr/pcre

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