[Subzero][MIPS32] Fix stack offset assignment of spilled variables on MIPS32

src/IceTargetLoweringMIPS32.h

 //===- subzero/src/IceTargetLoweringMIPS32.h - MIPS32 lowering ---*- C++-*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 402 matching lines @@
   void _xor(Variable *Dest, Variable *Src0, Variable *Src1) {
     Context.insert<InstMIPS32Xor>(Dest, Src0, Src1);
   }
 
   void _xori(Variable *Dest, Variable *Src, uint32_t Imm) {
     Context.insert<InstMIPS32Xori>(Dest, Src, Imm);
   }
 
   void lowerArguments() override;
 
+  /// Make a pass through the SortedSpilledVariables and actually assign stack
+  /// slots. SpillAreaPaddingBytes takes into account stack alignment padding.
+  /// The SpillArea starts after that amount of padding. This matches the scheme
+  /// in getVarStackSlotParams, where there may be a separate multi-block global
+  /// var spill area and a local var spill area.
+  void assignVarStackSlots(VarList &SortedSpilledVariables,
+                           size_t SpillAreaPaddingBytes,
+                           size_t SpillAreaSizeBytes,
+                           size_t GlobalsAndSubsequentPaddingSize);
+
   /// Operand legalization helpers.  To deal with address mode constraints,
   /// the helpers will create a new Operand and emit instructions that
   /// guarantee that the Operand kind is one of those indicated by the
   /// LegalMask (a bitmask of allowed kinds).  If the input Operand is known
   /// to already meet the constraints, it may be simply returned as the result,
   /// without creating any new instructions or operands.
   enum OperandLegalization {
     Legal_None = 0,
     Legal_Reg = 1 << 0, // physical register, not stack location
     Legal_Imm = 1 << 1,
@@ skipping 277 matching lines @@
   explicit TargetHeaderMIPS32(GlobalContext *Ctx);
 
 private:
   ~TargetHeaderMIPS32() = default;
 };
 
 } // end of namespace MIPS32
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGMIPS32_H