Build CodeSourceMap for each code object

runtime/vm/flow_graph_compiler_arm64.cc

Index: runtime/vm/flow_graph_compiler_arm64.cc
diff --git a/runtime/vm/flow_graph_compiler_arm64.cc b/runtime/vm/flow_graph_compiler_arm64.cc
index 30e421127e61d90037a650d916b5f343cfc52885..2c58018a6dd36b0e2a313a3dbedcbd42a5045958 100644
--- a/runtime/vm/flow_graph_compiler_arm64.cc
+++ b/runtime/vm/flow_graph_compiler_arm64.cc
@@ -1121,12 +1121,14 @@ void FlowGraphCompiler::CompileGraph() {
     }
   }
 
+  MaybeEmitCodeSourceMapEntry(TokenPosition::kDartCodePrologue);
   VisitBlocks();
 
   __ brk(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.
@@ -1136,8 +1138,9 @@ void FlowGraphCompiler::CompileGraph() {
       __ orr(R0, ZR, Operand(R0));  // nop
     }
     lazy_deopt_pc_offset_ = assembler()->CodeSize();
-  __ BranchPatchable(*StubCode::DeoptimizeLazy_entry());
+    __ BranchPatchable(*StubCode::DeoptimizeLazy_entry());
   }
+  MaybeEmitCodeSourceMapEntry(TokenPosition::kDartCodeEpilogue);
 }