Vector ICs: debugger should save registers for vector store ics.

src/arm64/debug-arm64.cc

Index: src/arm64/debug-arm64.cc
diff --git a/src/arm64/debug-arm64.cc b/src/arm64/debug-arm64.cc
index 59b2d1cfe32899b3f1674d1b2b62ae3c9206883c..ad9e42ae7ecc4d0b5e6d287852b1290e2ebf02cf 100644
--- a/src/arm64/debug-arm64.cc
+++ b/src/arm64/debug-arm64.cc
@@ -218,8 +218,11 @@ void DebugCodegen::GenerateStoreICDebugBreak(MacroAssembler* masm) {
   Register receiver = StoreDescriptor::ReceiverRegister();
   Register name = StoreDescriptor::NameRegister();
   Register value = StoreDescriptor::ValueRegister();
-  Generate_DebugBreakCallHelper(
-      masm, receiver.Bit() | name.Bit() | value.Bit(), 0, x10);
+  RegList regs = receiver.Bit() | name.Bit() | value.Bit();
+  if (FLAG_vector_stores) {
+    regs |= VectorStoreICDescriptor::SlotRegister().Bit();
+  }
+  Generate_DebugBreakCallHelper(masm, regs, 0, x10);
 }
 
 
@@ -231,11 +234,7 @@ void DebugCodegen::GenerateKeyedLoadICDebugBreak(MacroAssembler* masm) {
 
 void DebugCodegen::GenerateKeyedStoreICDebugBreak(MacroAssembler* masm) {
   // Calling convention for IC keyed store call (from ic-arm64.cc).
-  Register receiver = StoreDescriptor::ReceiverRegister();
-  Register name = StoreDescriptor::NameRegister();
-  Register value = StoreDescriptor::ValueRegister();
-  Generate_DebugBreakCallHelper(
-      masm, receiver.Bit() | name.Bit() | value.Bit(), 0, x10);
+  GenerateStoreICDebugBreak(masm);
 }