Further fix a throw returning to a frame marked for lazy deopt.

runtime/vm/stub_code_arm.cc

Index: runtime/vm/stub_code_arm.cc
diff --git a/runtime/vm/stub_code_arm.cc b/runtime/vm/stub_code_arm.cc
index 3bcf173ba07b6f33928c539493773cb1e531c585..8af9e5a0e209c4c19360d5f097bd664aec2a0168 100644
--- a/runtime/vm/stub_code_arm.cc
+++ b/runtime/vm/stub_code_arm.cc
@@ -522,7 +522,7 @@ static void GenerateDeoptimizationSequence(Assembler* assembler,
   __ CallRuntime(kDeoptimizeMaterializeRuntimeEntry, 0);
   // Result tells stub how many bytes to remove from the expression stack
   // of the bottom-most frame. They were used as materialization arguments.
-  __ Pop(R1);
+  __ Pop(R2);
   if (kind == kLazyDeoptFromReturn) {
     __ Pop(R0);  // Restore result.
   } else if (kind == kLazyDeoptFromThrow) {
@@ -531,7 +531,7 @@ static void GenerateDeoptimizationSequence(Assembler* assembler,
   }
   __ LeaveStubFrame();
   // Remove materialization arguments.
-  __ add(SP, SP, Operand(R1, ASR, kSmiTagSize));
+  __ add(SP, SP, Operand(R2, ASR, kSmiTagSize));
   __ Ret();
 }