remove arm-specific addressing in MemOperand
Branch to i-form (26-bit) from b-form (16-bit)
Fix build break
2nd batch of changes to replace lwz and stw using non-constant displacement w/
LoadWord() and StoreWord() in ic-ppc.cc and macro-assembler-ppc.cc
3rd batch fixes to replace non-constant displacement in lwz and stw by LoadWord and StoreWord
Define Assember::clrrwi and MacroAssembler::TestBit* / ExtractBit*

... as common higher-level operations built on top of the rlwinm
instruction.
Convert simple branch conditions and tst instructions in lithium-codegen-ppc.cc
Initial pass at porting deoptimizer-ppc.cc
Fix Deoptimizer::table_entry_size_
replace one use of addi + lwz by lwzu
Merge remote-tracking branch 'upstream/master'