Bug 1279312 - Remove SymbolicAddress::StackLimit. r=luke

This symbolic address is not used any longer. It has been replaced by the
stackLimit entry in the TlsData struct.

js/src/asmjs/WasmTypes.cpp

@@ -181,8 +181,6 @@ wasm::AddressOf(SymbolicAddress imm, ExclusiveContext* cx)
         return cx->runtimeAddressForJit();
       case SymbolicAddress::RuntimeInterruptUint32:
         return cx->runtimeAddressOfInterruptUint32();
-      case SymbolicAddress::StackLimit:
-        return cx->stackLimitAddressForJitCode(StackForUntrustedScript);
       case SymbolicAddress::ReportOverRecursed:
         return FuncCast(WasmReportOverRecursed, Args_General0);
       case SymbolicAddress::HandleExecutionInterrupt:

js/src/asmjs/WasmTypes.h

@@ -765,7 +765,6 @@ enum class SymbolicAddress
     ATan2D,
     Runtime,
     RuntimeInterruptUint32,
-    StackLimit,
     ReportOverRecursed,
     HandleExecutionInterrupt,
     HandleTrap,