fix tritonbench parser

Summary: this doesn't work if `--isolate` is the last arg

Reviewed By: xuzhao9

Differential Revision: D65837725

fbshipit-source-id: f24728ddb63623d8beb339feec12b35ca635d491

Author: nmacchioni

tritonbench/utils/parser.py

@@ -200,7 +200,7 @@ def _find_param_loc(params, key: str) -> int:
 def _remove_params(params, loc):
     if loc == -1:
         return params
-    if params[loc + 1].startswith("--"):
+    if (loc + 1) < len(params) and params[loc + 1].startswith("--"):
         return params[:loc] + params[loc + 1 :]
     return params[:loc] + params[loc + 2 :]