Fix kStoreBufferBlockProcessRuntimeEntry call sequence.

runtime/vm/assembler_ia32.cc

Index: runtime/vm/assembler_ia32.cc
diff --git a/runtime/vm/assembler_ia32.cc b/runtime/vm/assembler_ia32.cc
index 2aebb55e71282f497c8cd512d22c7d23146fdf77..20cfe9c8cc0c7fd83071814a804bd83bd443f721 100644
--- a/runtime/vm/assembler_ia32.cc
+++ b/runtime/vm/assembler_ia32.cc
@@ -1525,17 +1525,31 @@ void Assembler::ReserveAlignedFrameSpace(intptr_t frame_space) {
 }
 
 
-void Assembler::PreserveCallerSavedRegisters() {
+void Assembler::EnterCallRuntimeFrame(intptr_t frame_space) {
+  enter(Immediate(0));
+
+  // Preserve volatile registers.

[siva, 2012/07/27 20:41:21]

ASSERT(kNumberOfVolatileRegisters == 3);
or better still generate some assembly code similar to CHECK_STACK_ALIGNMENT
which would in debug mode ensure that EBP - ESP is (kNumberOfVolatileRegisters *
kWordSize);

   pushl(EAX);
   pushl(ECX);
   pushl(EDX);
+
+  ReserveAlignedFrameSpace(frame_space);
 }
 
 
-void Assembler::RestoreCallerSavedRegisters() {
+void Assembler::LeaveCallRuntimeFrame() {
+  // ESP might have been modified to reserve space for arguments
+  // and ensure proper alignment of the stack frame.
+  // We need to restore it before restoring registers.
+  const intptr_t kNumberOfVolatileRegisters = 3;

[siva, 2012/07/27 20:41:21]

Pull this to the class so that it is accessible from EnterCallRuntimeFrame also.

+  leal(ESP, Address(EBP, -kNumberOfVolatileRegisters * kWordSize));
+
+  // Restore volatile registers.

[siva, 2012/07/27 20:41:21]

ASSERT(kNumberofVolatileRegisters == 3);

   popl(EDX);
   popl(ECX);
   popl(EAX);
+
+  leave();
 }