Support for taking full snapshots from 'dart', not just 'dart_bootstrap'.

runtime/vm/precompiler.cc

Index: runtime/vm/precompiler.cc
diff --git a/runtime/vm/precompiler.cc b/runtime/vm/precompiler.cc
index b05b0bc877f0943fa93c2e0c343378ba2ebab53a..21e65582e0779252f2b22153686c06f12cd2c895 100644
--- a/runtime/vm/precompiler.cc
+++ b/runtime/vm/precompiler.cc
@@ -229,7 +229,13 @@ void Precompiler::DoCompileAll(
     zone_ = NULL;
   }
 
-  intptr_t dropped_symbols_count = Symbols::Compact(I);
+  intptr_t symbols_before = -1;
+  intptr_t symbols_after = -1;
+  intptr_t capacity = -1;
+  Symbols::GetStats(I, &symbols_before, &capacity);

[siva, 2016/05/10 00:49:10]

Should these two calls to Symbols::GetStats be under
if (FLAG_trace_precompiler)

[rmacnak, 2016/05/10 01:45:01]

Done.

+  Symbols::Compact(I);
+  Symbols::GetStats(I, &symbols_after, &capacity);
+
   if (FLAG_trace_precompiler) {
     THR_Print("Precompiled %" Pd " functions,", function_count_);
     THR_Print(" %" Pd " dynamic types,", class_count_);
@@ -237,7 +243,7 @@ void Precompiler::DoCompileAll(
 
     THR_Print("Dropped %" Pd " functions,", dropped_function_count_);
     THR_Print(" %" Pd " fields,", dropped_field_count_);
-    THR_Print(" %" Pd " symbols,", dropped_symbols_count);
+    THR_Print(" %" Pd " symbols,", symbols_before - symbols_after);
     THR_Print(" %" Pd " types,", dropped_type_count_);
     THR_Print(" %" Pd " type arguments,", dropped_typearg_count_);
     THR_Print(" %" Pd " classes,", dropped_class_count_);