[Compiler] Move static FinishCode function into CodeGenerator.

src/compiler/code-generator.h

Index: src/compiler/code-generator.h
diff --git a/src/compiler/code-generator.h b/src/compiler/code-generator.h
index 74958d05f3fb5383169b51460e27b309f23903aa..b4873ff2d8f91c01687ca9a2efd1e3d41291f1a7 100644
--- a/src/compiler/code-generator.h
+++ b/src/compiler/code-generator.h
@@ -178,6 +178,8 @@ class CodeGenerator final : public GapResolver::Assembler {
   void AssembleTailCallAfterGap(Instruction* instr,
                                 int first_unused_stack_slot);
 
+  void FinishCode();
+
   // ===========================================================================
   // ============== Architecture-specific gap resolver methods. ================
   // ===========================================================================