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 d1381c792ac7a2f4e28fdeee1e08914410d3d174..8f51f860778a6485ea54e725328e943ff4765747 100644
--- a/runtime/vm/flow_graph_compiler_mips.cc
+++ b/runtime/vm/flow_graph_compiler_mips.cc
@@ -1141,11 +1141,13 @@ void FlowGraphCompiler::CompileGraph() {
     }
   }
 
+  EndCodeSourceRange(TokenPosition::kDartCodePrologue);
   VisitBlocks();
 
   __ break_(0);
   GenerateDeferredCode();
 
+  BeginCodeSourceRange();
   if (is_optimizing() && !FLAG_precompiled_mode) {
     // Leave enough space for patching in case of lazy deoptimization from
     // deferred code.
@@ -1157,6 +1159,7 @@ void FlowGraphCompiler::CompileGraph() {
     lazy_deopt_pc_offset_ = assembler()->CodeSize();
     __ Branch(*StubCode::DeoptimizeLazy_entry());
   }
+  EndCodeSourceRange(TokenPosition::kDartCodeEpilogue);
 }