[Compiler] Move static FinishCode function into CodeGenerator.

src/compiler/x87/code-generator-x87.cc

Index: src/compiler/x87/code-generator-x87.cc
diff --git a/src/compiler/x87/code-generator-x87.cc b/src/compiler/x87/code-generator-x87.cc
index fc5992a9c157cebfdc695ebb0625948aa833307a..32f1019cd25a200d7949f393455b2f1120f4823d 100644
--- a/src/compiler/x87/code-generator-x87.cc
+++ b/src/compiler/x87/code-generator-x87.cc
@@ -2540,6 +2540,7 @@ void CodeGenerator::AssembleReturn(InstructionOperand* pop) {
   }
 }
 
+void CodeGenerator::FinishCode() {}
 
 void CodeGenerator::AssembleMove(InstructionOperand* source,
                                  InstructionOperand* destination) {