[turbofan] Add comments to CodeAssembler

src/compiler/mips64/code-generator-mips64.cc

Index: src/compiler/mips64/code-generator-mips64.cc
diff --git a/src/compiler/mips64/code-generator-mips64.cc b/src/compiler/mips64/code-generator-mips64.cc
index b122cbf9553af9bf8b2f7e4d07f4510e9d65352a..35128ee5e83176e583ee2497ae0d22b729d7bf0a 100644
--- a/src/compiler/mips64/code-generator-mips64.cc
+++ b/src/compiler/mips64/code-generator-mips64.cc
@@ -664,6 +664,11 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
     case kArchDebugBreak:
       __ stop("kArchDebugBreak");
       break;
+    case kArchComment: {
+      Address comment_string = i.InputExternalReference(0).address();
+      __ RecordComment(reinterpret_cast<const char*>(comment_string));
+      break;
+    }
     case kArchNop:
     case kArchThrowTerminator:
       // don't emit code for nops.