[tests] Skip regress-748069 for tsan as well. Reorganize tsan skips.

The tsan skips were getting a bit spread all over the place. Added a
section for them below msan and asan to keep things together, where
the only cause for skipping the test is tsan.

Bug: v8:7093
Change-Id: I606c3ab2f23e4159c12c1e81d28e855412158f15
Reviewed-on: https://chromium-review.googlesource.com/785810
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49599}

test/mjsunit/mjsunit.status

@@ -170,15 +170,6 @@
   'icu-date-to-string': [PASS, ['no_i18n == True', SKIP]],
   'icu-date-lord-howe': [PASS, ['no_i18n == True', SKIP]],
 
-  # Allocates a large array buffer, which TSAN sometimes cannot handle.
-  'regress/regress-599717': [PASS, ['tsan', SKIP]],
-
-  # BUG(v8:7042). Uses a lot of memory.
-  'regress/regress-678917': [PASS, ['tsan', SKIP]],
-
-  # BUG(v8:6924). The test uses a lot of memory.
-  'regress/wasm/regress-694433': [PASS, ['tsan', SKIP]],
-
   # TODO(bmeurer): Flaky timeouts (sometimes <1s, sometimes >3m).
   'unicodelctest': [PASS, NO_VARIANTS],
   'unicodelctest-no-optimization': [PASS, NO_VARIANTS],
@@ -414,6 +405,22 @@
   'regress/regress-779407': [PASS, SLOW],
 }],  # 'msan == True'
 
+##############################################################################
+['tsan == True', {
+  # https://bugs.chromium.org/p/v8/issues/detail?id=7102
+  # Flaky due to huge string allocation.
+  'regress/regress-748069': [SKIP],
+
+  # Allocates a large array buffer, which TSAN sometimes cannot handle.
+  'regress/regress-599717': [SKIP],
+
+  # BUG(v8:7042). Uses a lot of memory.
+  'regress/regress-678917': [SKIP],
+
+  # BUG(v8:6924). The test uses a lot of memory.
+  'regress/wasm/regress-694433': [SKIP],
+}],  # 'tsan == True'
+
 ##############################################################################
 ['arch == arm or arch == android_arm', {