[riscv64] Add riscv64 to the architecture list of js-perf-test

Change-Id: I541973c5b0570c1a1c23ce8e09cd20d3904df749
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2966198Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Ji Qiu <qiuji@iscas.ac.cn>
Cr-Commit-Position: refs/heads/master@{#75210}

tools/run_perf.py

@@ -136,7 +136,8 @@ SUPPORTED_ARCHS = ['arm',
                    'mips',
                    'mipsel',
                    'x64',
-                   'arm64']
+                   'arm64',
+                   'riscv64']
 
 GENERIC_RESULTS_RE = re.compile(r'^RESULT ([^:]+): ([^=]+)= ([^ ]+) ([^ ]*)$')
 RESULT_STDDEV_RE = re.compile(r'^\{([^\}]+)\}$')