[turbofan] move label generation to code generator

src/compiler/x64/code-generator-x64.cc

Index: src/compiler/x64/code-generator-x64.cc
diff --git a/src/compiler/x64/code-generator-x64.cc b/src/compiler/x64/code-generator-x64.cc
index bb02441ff5c373a55a36754772a766165395cfaa..be9af48d4bf57d610535423fcc00a9bc89227a89 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -238,7 +238,7 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       break;
     }
     case kArchJmp:
-      __ jmp(code_->GetLabel(i.InputRpo(0)));
+      __ jmp(GetLabel(i.InputRpo(0)));
       break;
     case kArchNop:
       // don't emit code for nops.
@@ -620,8 +620,8 @@ void CodeGenerator::AssembleArchBranch(Instruction* instr,
   BasicBlock::RpoNumber fblock =
       i.InputRpo(static_cast<int>(instr->InputCount()) - 1);
   bool fallthru = IsNextInAssemblyOrder(fblock);
-  Label* tlabel = code()->GetLabel(tblock);
-  Label* flabel = fallthru ? &done : code()->GetLabel(fblock);
+  Label* tlabel = GetLabel(tblock);
+  Label* flabel = fallthru ? &done : GetLabel(fblock);
   Label::Distance flabel_distance = fallthru ? Label::kNear : Label::kFar;
   switch (condition) {
     case kUnorderedEqual: