[SubZero] Provide repointEdges for MIPS

src/IceInstMIPS32.cpp

 //===- subzero/src/IceInstMips32.cpp - Mips32 instruction implementation --===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 /// \file
@@ skipping 182 matching lines @@
 InstMIPS32Br::InstMIPS32Br(Cfg *Func, const CfgNode *TargetTrue,
                            const CfgNode *TargetFalse, Operand *Src0,
                            Operand *Src1, const InstMIPS32Label *Label,
                            CondMIPS32::Cond Cond)
     : InstMIPS32(Func, InstMIPS32::Br, 2, nullptr), TargetTrue(TargetTrue),
       TargetFalse(TargetFalse), Label(Label), Predicate(Cond) {
   addSource(Src0);
   addSource(Src1);
 }
 
+bool InstMIPS32Br::repointEdges(CfgNode *OldNode, CfgNode *NewNode) {
+  bool Found = false;
+  if (TargetFalse == OldNode) {
+    TargetFalse = NewNode;
+    Found = true;
+  }
+  if (TargetTrue == OldNode) {
+    TargetTrue = NewNode;
+    Found = true;
+  }
+  return Found;
+}
+
 InstMIPS32Label::InstMIPS32Label(Cfg *Func, TargetMIPS32 *Target)
     : InstMIPS32(Func, InstMIPS32::Label, 0, nullptr),
       Number(Target->makeNextLabelNumber()) {
   if (BuildDefs::dump()) {
     Name = GlobalString::createWithString(
         Func->getContext(),
         ".L" + Func->getFunctionName() + "$local$__" + std::to_string(Number));
   } else {
     Name = GlobalString::createWithoutString(Func->getContext());
   }
@@ skipping 462 matching lines @@
     getSrc(0)->emit(Func);
     return;
   }
 
   // stack to stack
   llvm::report_fatal_error("mov cant copy stack to stack.");
 }
 
 } // end of namespace MIPS32
 } // end of namespace Ice