Build CodeSourceMap for each code object

runtime/vm/flow_graph_compiler_arm.cc

Index: runtime/vm/flow_graph_compiler_arm.cc
diff --git a/runtime/vm/flow_graph_compiler_arm.cc b/runtime/vm/flow_graph_compiler_arm.cc
index 2b1454502b9595bb9d4758ebdce0dd94c5780c2a..0bbb5a77c9fba9fcec277cd7aefa4967c69a93fd 100644
--- a/runtime/vm/flow_graph_compiler_arm.cc
+++ b/runtime/vm/flow_graph_compiler_arm.cc
@@ -1128,12 +1128,14 @@ void FlowGraphCompiler::CompileGraph() {
     }
   }
 
+  MaybeEmitCodeSourceMapEntry(TokenPosition::kDartCodePrologue);
   VisitBlocks();
 
   __ bkpt(0);
   ASSERT(assembler()->constant_pool_allowed());
   GenerateDeferredCode();
 
+  SaveCodeSize();
   if (is_optimizing() && !FLAG_precompilation) {
     // Leave enough space for patching in case of lazy deoptimization from
     // deferred code.
@@ -1145,6 +1147,7 @@ void FlowGraphCompiler::CompileGraph() {
     lazy_deopt_pc_offset_ = assembler()->CodeSize();
     __ Branch(*StubCode::DeoptimizeLazy_entry());
   }
+  MaybeEmitCodeSourceMapEntry(TokenPosition::kDartCodeEpilogue);
 }