Add VLOG(collector) to reduce log spam

VLOG(gc) is enabled from AndroidRuntime, using it too much produces
log spam.

Bug: 22858531

(cherry picked from commit a6e1c126299586932ecd3c1133a55a6f8e1107fc)

Change-Id: If60902a8d7855cdabd80208b9b385ce4ba4d9e5f
diff --git a/cmdline/cmdline_parser_test.cc b/cmdline/cmdline_parser_test.cc
index dc2c9c9..81b854e 100644
--- a/cmdline/cmdline_parser_test.cc
+++ b/cmdline/cmdline_parser_test.cc
@@ -291,6 +291,13 @@
   }
 
   {
+    const char* log_args = "-verbose:collector";
+    LogVerbosity log_verbosity = LogVerbosity();
+    log_verbosity.collector = true;
+    EXPECT_SINGLE_PARSE_VALUE(log_verbosity, log_args, M::Verbose);
+  }
+
+  {
     const char* log_args = "-verbose:oat";
     LogVerbosity log_verbosity = LogVerbosity();
     log_verbosity.oat = true;