https://bugs.webkit.org/show_bug.cgi?id=123182

Reviewed by Geoffrey Garen.

Adjusted the virtual register mapping down by one slot.  Reduced
the CallFrame header slots offsets by one.  They now start at 0.
Changed arity fixup to no longer skip passed register slot 0 as this
is now part of the CallFrame header.

* bytecode/VirtualRegister.h:
(JSC::operandIsLocal):
(JSC::operandIsArgument):
(JSC::VirtualRegister::localToOperand):
(JSC::VirtualRegister::operandToLocal):
  Adjusted functions for shift in mapping from local to register offset.

* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::findArgumentPositionForLocal):
(JSC::DFG::ByteCodeParser::addCall):
(JSC::DFG::ByteCodeParser::handleInlining):
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGVariableEventStream.cpp:
(JSC::DFG::VariableEventStream::reconstruct):
* dfg/DFGVirtualRegisterAllocationPhase.cpp:
(JSC::DFG::VirtualRegisterAllocationPhase::run):
* interpreter/CallFrame.h:
(JSC::ExecState::frameExtent):
(JSC::ExecState::offsetFor):
* interpreter/Interpreter.cpp:
(JSC::loadVarargs):
(JSC::Interpreter::dumpRegisters):
(JSC::Interpreter::executeCall):
* llint/LLIntData.cpp:
(JSC::LLInt::Data::performAssertions):
* llint/LowLevelInterpreter.asm:
  Adjusted math to accomodate for shift in call frame slots.

* dfg/DFGJITCompiler.cpp:
(JSC::DFG::JITCompiler::compileFunction):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::calleeFrameOffset):
* interpreter/CallFrame.cpp:
(JSC::CallFrame::frameExtentInternal):
* interpreter/JSStackInlines.h:
(JSC::JSStack::pushFrame):
* jit/JIT.cpp:
(JSC::JIT::privateCompile):
* jit/JITOperations.cpp:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::llint_slow_path_stack_check):
* runtime/CommonSlowPaths.h:
(JSC::CommonSlowPaths::arityCheckFor):
  Fixed offset calculation to use VirtualRegister and related calculation instead of
  doing seperate calculations.

* interpreter/JSStack.h:
  Adjusted CallFrame slots down by one.  Did some miscellaneous fixing of dumpRegisters()
  in the process of testing the fixes.

* jit/ThunkGenerators.cpp:
(JSC::arityFixup):
  Changed arity fixup to no longer skip passed register slot 0 as this
  is now part of the CallFrame header.

* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
  Changed arity fixup to no longer skip passed register slot 0 as this
  is now part of the CallFrame header.  Updated op_enter processing for
  the change in local registers.

* runtime/JSGlobalObject.h:
  Removed the now unneeded extra slot in the global callframe


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@158237 268f45cc-cd09-0410-ab3c-d52691b4dbfc