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

src/arm64/regexp-macro-assembler-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "cpu-profiler.h"
 #include "unicode.h"
@@ skipping 958 matching lines @@
     if (global()) {
       __ Ldr(w0, MemOperand(frame_pointer(), kSuccessCounter));
     }
   }
 
   __ Bind(&return_w0);
 
   // Set stack pointer back to first register to retain
   ASSERT(csp.Is(__ StackPointer()));
   __ Mov(csp, fp);
+  __ AssertStackConsistency();
 
   // Restore registers.
   __ PopCPURegList(registers_to_retain);
 
   __ Ret();
 
   Label exit_with_exception;
   // Registers x0 to x7 are used to store the first captures, they need to be
   // retained over calls to C++ code.
   CPURegList cached_registers(CPURegister::kRegister, kXRegSizeInBits, 0, 7);
@@ skipping 707 matching lines @@
       __ Ldrh(current_character(), MemOperand(input_end(), offset, SXTW));
     }
   }
 }
 
 #endif  // V8_INTERPRETED_REGEXP
 
 }}  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64