Restore GenClass's --temp_dir flag once more

PiperOrigin-RevId: 339888590

src/java_tools/buildjar/java/com/google/devtools/build/buildjar/genclass/GenClassOptionsParser.java

diff --git a/src/java_tools/buildjar/java/com/google/devtools/build/buildjar/genclass/GenClassOptionsParser.java b/src/java_tools/buildjar/java/com/google/devtools/build/buildjar/genclass/GenClassOptionsParser.java
index e6ed6e8..795eac0 100644
--- a/src/java_tools/buildjar/java/com/google/devtools/build/buildjar/genclass/GenClassOptionsParser.java
+++ b/src/java_tools/buildjar/java/com/google/devtools/build/buildjar/genclass/GenClassOptionsParser.java
@@ -36,6 +36,10 @@
         case "--output_jar":
           builder.setOutputJar(readPath(it));
           break;
+        case "--temp_dir":
+          // TODO(b/169793789): remove once Blaze no longer passes the flag
+          readPath(it);
+          break;
         default:
           throw new IllegalArgumentException(
               String.format("Unexpected argument: '%s' in %s", arg, args));