V8 Buildbot: Let leak checker use the v8-side wrapper.

masters/master.client.v8/master.cfg

Index: masters/master.client.v8/master.cfg
diff --git a/masters/master.client.v8/master.cfg b/masters/master.client.v8/master.cfg
index 962d56fb925f1534afc78c09b1bc97ed291a21c5..6548a5e2382fe2e54d8bc73c9d96d13be690d437 100644
--- a/masters/master.client.v8/master.cfg
+++ b/masters/master.client.v8/master.cfg
@@ -757,8 +757,8 @@ b_v8_linux_arm64_sim_msan = {
   'auto_reboot' : False,
 }
 
-b_v8_linux_memcheck = {
-  'name': 'V8 Linux - memcheck',
+b_v8_linux64_memcheck = {
+  'name': 'V8 Linux64 - memcheck',
   'slavebuilddir': 'linux',
   'factory': m_annotator.BaseFactory('v8'),
   'category': CATEGORY_SANITIZERS,
@@ -1009,7 +1009,7 @@ c['builders'] = [b_v8_linux_builder,
                  b_v8_linux64_tsan,
                  b_v8_linux64_cfi,
                  b_v8_linux_arm64_sim_msan,
-                 b_v8_linux_memcheck,
+                 b_v8_linux64_memcheck,
                  b_v8_linux64_asan_no_inline_builder,
                  b_v8_linux64_asan_debug_builder,
                  b_v8_linux64_asan_arm64_debug_builder,