ART: Log /proc/self/maps for RegionSpace failure

Log the complete process maps.

Bug: 117320141
Test: mmma art
Change-Id: I4c695e46c6af01d0f8d04ca871298707519688ce
diff --git a/runtime/gc/space/region_space.cc b/runtime/gc/space/region_space.cc
index 171af6f..9a422af 100644
--- a/runtime/gc/space/region_space.cc
+++ b/runtime/gc/space/region_space.cc
@@ -70,6 +70,7 @@
   if (!mem_map.IsValid()) {
     LOG(ERROR) << "Failed to allocate pages for alloc space (" << name << ") of size "
         << PrettySize(capacity) << " with message " << error_msg;
+    PrintFileToLog("/proc/self/maps", LogSeverity::ERROR);
     MemMap::DumpMaps(LOG_STREAM(ERROR));
     return MemMap::Invalid();
   }