Store FP instead of SP in the exit info when transitioning from Dart to C++.

runtime/vm/stub_code_ia32.cc

Index: runtime/vm/stub_code_ia32.cc
diff --git a/runtime/vm/stub_code_ia32.cc b/runtime/vm/stub_code_ia32.cc
index e8b0245a7e1af06afeb2d3a47d82dedb0e3db812..30dbe75d2ba690dd05fcd85e1ed2160344348cde 100644
--- a/runtime/vm/stub_code_ia32.cc
+++ b/runtime/vm/stub_code_ia32.cc
@@ -52,7 +52,7 @@ void StubCode::GenerateCallToRuntimeStub(Assembler* assembler) {
 
   // Save exit frame information to enable stack walking as we are about
   // to transition to Dart VM C++ code.
-  __ movl(Address(ESI, Isolate::top_exit_frame_info_offset()), ESP);
+  __ movl(Address(ESI, Isolate::top_exit_frame_info_offset()), EBP);
 
 #if defined(DEBUG)
   { Label ok;
@@ -142,7 +142,7 @@ void StubCode::GenerateCallNativeCFunctionStub(Assembler* assembler) {
 
   // Save exit frame information to enable stack walking as we are about
   // to transition to dart VM code.
-  __ movl(Address(ESI, Isolate::top_exit_frame_info_offset()), ESP);
+  __ movl(Address(ESI, Isolate::top_exit_frame_info_offset()), EBP);
 
 #if defined(DEBUG)
   { Label ok;
@@ -215,7 +215,7 @@ void StubCode::GenerateCallBootstrapCFunctionStub(Assembler* assembler) {
 
   // Save exit frame information to enable stack walking as we are about
   // to transition to dart VM code.
-  __ movl(Address(ESI, Isolate::top_exit_frame_info_offset()), ESP);
+  __ movl(Address(ESI, Isolate::top_exit_frame_info_offset()), EBP);
 
 #if defined(DEBUG)
   { Label ok;