Fix the compilation issue for turbofan unsupported backend which

is introduced by https://chromium.googlesource.com/v8/v8/+/aed26c05a50b2a1257ef8accc67143825f2e1f60.
( [turbofan] Clean up and factor out branch generation logic.)

BUG=

Review URL: https://codereview.chromium.org/748673002

Cr-Commit-Position: refs/heads/master@{#25452}

src/compiler/code-generator.cc

@@ -512,7 +512,7 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
 
 
 void CodeGenerator::AssembleArchBranch(Instruction* instr,
-                                       FlagsCondition condition) {
+                                       BranchInfo* branch) {
   UNIMPLEMENTED();
 }
 
@@ -523,6 +523,11 @@ void CodeGenerator::AssembleArchBoolean(Instruction* instr,
 }
 
 
+void CodeGenerator::AssembleArchJump(BasicBlock::RpoNumber target) {
+  UNIMPLEMENTED();
+}
+
+
 void CodeGenerator::AssembleDeoptimizerCall(int deoptimization_id) {
   UNIMPLEMENTED();
 }