A64: Initialize CPURegisters before we use them in MacroAssembler::PrintfNoPreserve

src/a64/macro-assembler-a64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 4524 matching lines @@
 
   static const int kMaxArgCount = 4;
   // Assume that we have the maximum number of arguments until we know
   // otherwise.
   int arg_count = kMaxArgCount;
 
   // The provided arguments.
   CPURegister args[kMaxArgCount] = {arg0, arg1, arg2, arg3};
 
   // The PCS registers where the arguments need to end up.
-  CPURegister pcs[kMaxArgCount];
+  CPURegister pcs[kMaxArgCount] = {NoCPUReg, NoCPUReg, NoCPUReg, NoCPUReg};
 
   // Promote FP arguments to doubles, and integer arguments to X registers.
   // Note that FP and integer arguments cannot be mixed, but we'll check
   // AreSameSizeAndType once we've processed these promotions.
   for (int i = 0; i < kMaxArgCount; i++) {
     if (args[i].IsRegister()) {
       // Note that we use x1 onwards, because x0 will hold the format string.
       pcs[i] = Register::XRegFromCode(i + 1);
       // For simplicity, we handle all integer arguments as X registers. An X
       // register argument takes the same space as a W register argument in the
@@ skipping 274 matching lines @@
   }
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_A64