Build CodeSourceMap for each code object

runtime/vm/flow_graph_compiler_mips.cc

Index: runtime/vm/flow_graph_compiler_mips.cc
diff --git a/runtime/vm/flow_graph_compiler_mips.cc b/runtime/vm/flow_graph_compiler_mips.cc
index 273a0e0e08f73a4112c1c5610da6149249d30c7c..f60be21c6929e268067c76f30013c626faa7d8c4 100644
--- a/runtime/vm/flow_graph_compiler_mips.cc
+++ b/runtime/vm/flow_graph_compiler_mips.cc
@@ -1142,11 +1142,13 @@ void FlowGraphCompiler::CompileGraph() {
     }
   }
 
+  MaybeEmitCodeSourceMapEntry(TokenPosition::kDartCodePrologue);
   VisitBlocks();
 
   __ break_(0);
   GenerateDeferredCode();
 
+  SaveCodeSize();
   if (is_optimizing() && !FLAG_precompilation) {
     // Leave enough space for patching in case of lazy deoptimization from
     // deferred code.
@@ -1158,6 +1160,7 @@ void FlowGraphCompiler::CompileGraph() {
     lazy_deopt_pc_offset_ = assembler()->CodeSize();
     __ Branch(*StubCode::DeoptimizeLazy_entry());
   }
+  MaybeEmitCodeSourceMapEntry(TokenPosition::kDartCodeEpilogue);
 }