Add A/B testing command line arguments

Core A/B Testing Features:
- Add --side-a/-a and --side-b/-b params
- Validation for single operator requirement  
- Error messages for wrong usage

Example usage:
python run.py --op vector_add --side-a "--precision fp16" --side-b "--precision fp32"

Author: jialiangqu

tritonbench/utils/parser.py

@@ -246,6 +246,24 @@ def get_parser(args=None):
         default=None,
         help="Name of group for benchmarking.",
     )
+    
+    # A/B Testing parameters
+    parser.add_argument(
+        "--side-a",
+        "-a",
+        type=str,
+        default=None,
+        help="Configuration A for A/B testing. Specify operator-specific arguments as a string. "
+             "Example: '--side-a \"--max-autotune --dynamic\"'",
+    )
+    parser.add_argument(
+        "--side-b",
+        "-b", 
+        type=str,
+        default=None,
+        help="Configuration B for A/B testing. Specify operator-specific arguments as a string. "
+             "Example: '--side-b \"--dynamic\"'",
+    )
 
     if is_fbcode():
         parser.add_argument("--log-scuba", action="store_true", help="Log to scuba.")
@@ -268,4 +286,19 @@ def get_parser(args=None):
         print(
             "Neither operator nor operator collection is specified. Running all operators in the default collection."
         )
+    
+    # A/B Testing validation
+    if (args.side_a is not None) != (args.side_b is not None):
+        parser.error("A/B testing requires both --side-a and --side-b arguments to be specified together")
+    
+    if args.side_a is not None and args.side_b is not None:
+        # A/B mode is enabled
+        if not args.op:
+            parser.error("A/B testing requires a specific operator (--op) to be specified")
+        if args.op_collection != "default":
+            parser.error("A/B testing is only supported with single operators, not operator collections")
+        if "," in args.op:
+            parser.error("A/B testing is only supported with a single operator, not multiple operators")
+        if args.isolate:
+            parser.error("A/B testing is not compatible with --isolate mode")
     return parser