X87: [turbofan] Add comments to CodeAssembler.

  port 40b5c1d4(r36842)

  original commit message:

BUG=

Review-Url: https://codereview.chromium.org/2080873003
Cr-Commit-Position: refs/heads/master@{#37124}

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

@@ -606,6 +606,11 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
     case kArchTableSwitch:
       AssembleArchTableSwitch(instr);
       break;
+    case kArchComment: {
+      Address comment_string = i.InputExternalReference(0).address();
+      __ RecordComment(reinterpret_cast<const char*>(comment_string));
+      break;
+    }
     case kArchDebugBreak:
       __ int3();
       break;