[mjsunit] Fix tmp log files for --log tests

https://crrev.com/c/2972915 previously added more gitignore files to the
repository. This left the repo dirty after running mjsunit tests due to
lingering .log files.

- Add test/mjsunit/tools/tmp dir to keep and ignore temporary log files
  without the need for a platform specific tmp dir
- Use temporary logfiles with --logfile=+ for log-ci.js tests

Change-Id: I1b1a47f45603d6c3027c6ca7050c78e8df0664ce
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2992720Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75451}

test/mjsunit/tools/log-ic.js

@@ -2,8 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --log-ic --logfile=test/mjsunit/tools/log-ic-test.log
-// Flags: --allow-natives-syntax
+// Flags: --log-ic --logfile='+' --allow-natives-syntax
 
 // The idea behind this test is to make sure we do not crash when using the
 // --log-ic flag.

test/mjsunit/tools/tickprocessor.mjs

@@ -470,35 +470,35 @@ function testTickProcessor(logInput, refOutput, args=[]) {
   // /foo/bar/tickprocesser.mjs => /foo/bar/
   const dir = import.meta.url.split("/").slice(0, -1).join('/') + '/';
   const params = ArgumentsProcessor.process(args);
-  testExpectations(dir + logInput, dir + refOutput, params);
+  testExpectations(dir, logInput, refOutput, params);
   // TODO(cbruni): enable again after it works on bots
-  // testEndToEnd(dir + 'tickprocessor-test-large.js', dir + refOutput,  params);
+  // testEndToEnd(dir, 'tickprocessor-test-large.js', refOutput,  params);
 }
 
-function testExpectations(logInput, refOutput, params) {
-  const symbolsFile = logInput + '.symbols.json';
+function testExpectations(dir, logInput, refOutput, params) {
+  const symbolsFile = dir + logInput + '.symbols.json';
   const cppEntries = new CppEntriesProviderMock(symbolsFile);
   const tickProcessor = TickProcessor.fromParams(params, cppEntries);
-  const printMonitor = new PrintMonitor(refOutput);
-  tickProcessor.processLogFileInTest(logInput);
+  const printMonitor = new PrintMonitor(dir + refOutput);
+  tickProcessor.processLogFileInTest(dir + logInput);
   tickProcessor.printStatistics();
   printMonitor.finish();
 };
 
-function testEndToEnd(sourceFile, ignoredRefOutput, params) {
+function testEndToEnd(dir, sourceFile, ignoredRefOutput, params) {
   // This test only works on linux.
   if (!os?.system) return;
   if (os.name !== 'linux' && os.name !== 'macos') return;
   params.platform = os.name;
   const tmpLogFile= `/var/tmp/${Date.now()}.v8.log`
   const result = os.system(
-    os.d8Path, ['--prof', `--logfile=${tmpLogFile}`, sourceFile]);
+    os.d8Path, ['--prof', `--logfile=${tmpLogFile}`, dir + sourceFile]);
 
   const tickProcessor = TickProcessor.fromParams(params);
   // We will not always get the same ticks due to timing on bots,
   // hence we cannot properly compare output expectations.
   // Let's just use a dummy file and only test whether we don't throw.
-  const printMonitor = new PrintMonitor(ignoredRefOutput);
+  const printMonitor = new PrintMonitor(dir + ignoredRefOutput);
   tickProcessor.processLogFileInTest(tmpLogFile);
   tickProcessor.printStatistics();
 }
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