https://bugs.webkit.org/show_bug.cgi?id=108840

Reviewed in person by Filip Pizlo.

Added ARMv7s integer divide path for ArithDiv and ArithMod where operands and results are integer.
This is patterned after the similar code for X86.  Also added modulo power of 2 optimization
that uses logical and.  Added sdiv and udiv to the ARMv7 disassembler.  Put all the changes
behind #if CPU(APPLE_ARMV7S). 

* assembler/ARMv7Assembler.h:
(ARMv7Assembler):
(JSC::ARMv7Assembler::sdiv):
(JSC::ARMv7Assembler::udiv):
* dfg/DFGCommon.h:
(JSC::DFG::isARMv7s):
* dfg/DFGFixupPhase.cpp:
(JSC::DFG::FixupPhase::fixupNode):
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileSoftModulo):
(JSC::DFG::SpeculativeJIT::compileIntegerArithDivForARMv7s):
* dfg/DFGSpeculativeJIT.h:
(SpeculativeJIT):
* dfg/DFGSpeculativeJIT32_64.cpp:
(JSC::DFG::SpeculativeJIT::compile):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141788 268f45cc-cd09-0410-ab3c-d52691b4dbfc