Reland - Arm64: Ensure that csp is always aligned to 16 byte values even if jssp is not.

test/cctest/test-assembler-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
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 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
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@@ skipping 8366 matching lines @@
 // proper word-endian behaviour.
 static void PushPopJsspSimpleHelper(int reg_count,
                                     int claim,
                                     int reg_size,
                                     PushPopMethod push_method,
                                     PushPopMethod pop_method) {
   SETUP();
 
   START();
 
-  // Registers x8 and x9 are used by the macro assembler for debug code (for
-  // example in 'Pop'), so we can't use them here. We can't use jssp because it
-  // will be the stack pointer for this test.
-  static RegList const allowed = ~(x8.Bit() | x9.Bit() | jssp.Bit());
+  // Registers in the TmpList can be used by the macro assembler for debug code
+  // (for example in 'Pop'), so we can't use them here. We can't use jssp
+  // because it will be the stack pointer for this test.
+  static RegList const allowed = ~(masm.TmpList()->list() | jssp.Bit());
   if (reg_count == kPushPopJsspMaxRegCount) {
     reg_count = CountSetBits(allowed, kNumberOfRegisters);
   }
   // Work out which registers to use, based on reg_size.
   Register r[kNumberOfRegisters];
   Register x[kNumberOfRegisters];
   RegList list = PopulateRegisterArray(NULL, x, r, reg_size, reg_count,
                                        allowed);
 
   // The literal base is chosen to have two useful properties:
@@ skipping 2557 matching lines @@
     if (RelocInfo::IsVeneerPool(info->rmode())) {
       ASSERT(info->data() == veneer_pool_size);
       ++pool_count;
     }
   }
 
   ASSERT(pool_count == 2);
 
   TEARDOWN();
 }