Fix kStoreBufferBlockProcessRuntimeEntry call sequence.

runtime/vm/stub_code_x64.cc

Index: runtime/vm/stub_code_x64.cc
diff --git a/runtime/vm/stub_code_x64.cc b/runtime/vm/stub_code_x64.cc
index b55c4e20e1d3e1f205fb6ca4e3a18ba1e2d60020..6f4d4c4b57e70a3d2f885c4150df7a9c563f60db 100644
--- a/runtime/vm/stub_code_x64.cc
+++ b/runtime/vm/stub_code_x64.cc
@@ -102,15 +102,10 @@ END_LEAF_RUNTIME_ENTRY
 //   RDI : stop message (const char*).
 // Must preserve all registers.
 void StubCode::GeneratePrintStopMessageStub(Assembler* assembler) {
-  __ enter(Immediate(0));
-  __ PreserveCallerSavedRegisters();
-
+  __ EnterCallRuntimeFrame(0);
   // Call the runtime leaf function. RDI already contains the parameter.
-  __ ReserveAlignedFrameSpace(0);
   __ CallRuntime(kPrintStopMessageRuntimeEntry);
-
-  __ RestoreCallerSavedRegisters();
-  __ leave();
+  __ LeaveCallRuntimeFrame();
   __ ret();
 }
 
@@ -1087,14 +1082,10 @@ void StubCode::GenerateUpdateStoreBufferStub(Assembler* assembler) {
   // Handle overflow: Call the runtime leaf function.
   __ Bind(&L);
   // Setup frame, push callee-saved registers.
-  __ enter(Immediate(0));
-  __ PreserveCallerSavedRegisters();
-  __ ReserveAlignedFrameSpace(0);
+  __ EnterCallRuntimeFrame(0);
   __ movq(RDI, FieldAddress(CTX, Context::isolate_offset()));
   __ CallRuntime(kStoreBufferBlockProcessRuntimeEntry);
-  // Restore callee-saved registers, tear down frame.
-  __ RestoreCallerSavedRegisters();
-  __ leave();
+  __ LeaveCallRuntimeFrame();
   __ ret();
 }