A64: In the Simulator, corrupt caller-saved registers after runtime printf call.

src/a64/simulator-a64.cc

Index: src/a64/simulator-a64.cc
diff --git a/src/a64/simulator-a64.cc b/src/a64/simulator-a64.cc
index 3801bf7514f46dfcadf50bb609d31bd32bcdc535..f2e7b67b2f0aae8cd4d7690b134a17f108eea7bd 100644
--- a/src/a64/simulator-a64.cc
+++ b/src/a64/simulator-a64.cc
@@ -3631,9 +3631,12 @@ void Simulator::VisitException(Instruction* instr) {
           result = fprintf(stream_, "%s", format);
         }
         fputs(clr_normal, stream_);
-        set_xreg(0, result);
 
-        // TODO(jbramley): Consider clobbering all caller-saved registers here.
+#ifdef DEBUG
+        CorruptAllCallerSavedCPURegisters();
+#endif
+
+        set_xreg(0, result);
 
         // The printf parameters are inlined in the code, so skip them.
         set_pc(pc_->InstructionAtOffset(kPrintfLength));