[foozzie] Fix fuzzer arguments and test case

NOTRY=true

Bug: chromium:777285
Change-Id: I89a0da2d524a84efdcdcb3df45bef11703340cde
Reviewed-on: https://chromium-review.googlesource.com/735152
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48880}

tools/foozzie/testdata/failure_output.txt

@@ -9,9 +9,9 @@
 # Compared x64,ignition with x64,ignition_turbo
 #
 # Flags of x64,ignition:
---abort_on_stack_or_string_length_overflow --expose-gc --allow-natives-syntax --invoke-weak-callbacks --omit-quit --es-staging --random-seed 12345 --turbo-filter=~ --noopt
+--abort_on_stack_or_string_length_overflow --expose-gc --allow-natives-syntax --invoke-weak-callbacks --omit-quit --es-staging --random-seed 12345 --turbo-filter=~ --noopt --suppress-asm-messages
 # Flags of x64,ignition_turbo:
---abort_on_stack_or_string_length_overflow --expose-gc --allow-natives-syntax --invoke-weak-callbacks --omit-quit --es-staging --random-seed 12345
+--abort_on_stack_or_string_length_overflow --expose-gc --allow-natives-syntax --invoke-weak-callbacks --omit-quit --es-staging --random-seed 12345 --suppress-asm-messages
 #
 # Difference:
 - unknown

tools/foozzie/testdata/v8_build_config.json

@@ -1 +1 @@
-{"v8_current_cpu": "x64"}
+{"v8_target_cpu": "x64"}

tools/foozzie/v8_foozzie.py

@@ -173,9 +173,9 @@ def parse_args():
   options.second_arch = infer_arch(options.second_d8)
 
   # Ensure we make a sane comparison.
-  assert (options.first_arch != options.second_arch or
-          options.first_config != options.second_config), (
-      'Need either arch or config difference.')
+  if (options.first_arch == options.second_arch and
+      options.first_config == options.second_config):
+    parser.error('Need either arch or config difference.')
   assert options.first_arch in SUPPORTED_ARCHS
   assert options.second_arch in SUPPORTED_ARCHS
   assert options.first_config in CONFIGS
@@ -260,7 +260,7 @@ def main():
       args = [sys.executable] + args
     return v8_commands.Execute(
         args,
-        cwd=os.path.dirname(options.testcase),
+        cwd=os.path.dirname(os.path.abspath(options.testcase)),
         timeout=TIMEOUT,
     )