Bug 122306 does not depend on any bugs.

Bug 122306 blocks 7 bugs:

•    122306: Add callOperation to Baseline JIT [RESOLVED FIXED; assigned to msaboff]
  •    122287: Transition JITStubs functions to CCallHelper functions [RESOLVED FIXED; assigned to msaboff]
    •    121756: Get rid of JITStubs and its special use of JITStackFrame for calls [RESOLVED FIXED; assigned to msaboff]
      •    116888: JSC Should use the C Stack for JIT code [RESOLVED FIXED; assigned to msaboff]
        •    113621: FTL should force LLVM to use our calling convention [RESOLVED FIXED; assigned to fpizlo]
          •    112840: Use LLVM as a backend for the fourth-tier DFG JIT (a.k.a. the FTL JIT) [RESOLVED FIXED; assigned to fpizlo]
            •    132356: Continue to expand FTL JIT coverage [NEW; assigned to fpizlo]
            •    112836: JSC should be a quadruple-tier VM [RESOLVED FIXED; assigned to fpizlo]