[tools] Remove support for Haswell trybots

R=machenbach@chromium.org

Bug: chromium:616879
Change-Id: I78a204d3620a1ea28bfd93f019b122f2186f009b
Reviewed-on: https://chromium-review.googlesource.com/c/1323909
Commit-Queue: Sergiy Byelozyorov <sergiyb@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57329}

tools/try_perf.py

@@ -13,7 +13,6 @@ BOTS = {
   '--linux32': 'v8_linux32_perf_try',
   '--linux64': 'v8_linux64_perf_try',
   '--linux64_atom': 'v8_linux64_atom_perf_try',
-  '--linux64_haswell': 'v8_linux64_haswell_perf_try',
   '--nexus5': 'v8_nexus5_perf_try',
   '--nexus7': 'v8_nexus7_perf_try',
   '--nexus10': 'v8_nexus10_perf_try',
@@ -32,7 +31,7 @@ SWARMING_BOTS = [
 DEFAULT_BOTS = [
   'v8_arm32_perf_try',
   'v8_linux32_perf_try',
-  'v8_linux64_haswell_perf_try',
+  'v8_linux64_perf_try',
   'v8_nexus10_perf_try',
 ]