Disable info messages by default for malloc debug.

Add a new option verbose for malloc debug that is not enabled by default.
This disables all of the info log messages. It turns out these log
messages can add a measurable amount of time and can change the boot up.

Bug: 129239269

Test: Adjusted unit tests pass.
Test: Verified no messages unless verbose option used.
Change-Id: I805cb7c8ecb44de88119574e59d784877cacc383
diff --git a/libc/malloc_debug/RecordData.cpp b/libc/malloc_debug/RecordData.cpp
index aea2513..5c550c0 100644
--- a/libc/malloc_debug/RecordData.cpp
+++ b/libc/malloc_debug/RecordData.cpp
@@ -181,8 +181,10 @@
   }
   pthread_setspecific(key_, nullptr);
 
-  info_log("%s: Run: 'kill -%d %d' to dump the allocation records.", getprogname(),
-           config.record_allocs_signal(), getpid());
+  if (config.options() & VERBOSE) {
+    info_log("%s: Run: 'kill -%d %d' to dump the allocation records.", getprogname(),
+             config.record_allocs_signal(), getpid());
+  }
 
   num_entries_ = config.record_allocs_num_entries();
   entries_ = new const RecordEntry*[num_entries_];