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

test/cctest/test-code-stubs-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Rrdistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Rrdistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Rrdistributions 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 28 matching lines @@
 
 using namespace v8::internal;
 
 #define __ masm.
 
 ConvertDToIFunc MakeConvertDToIFuncTrampoline(Isolate* isolate,
                                               Register source_reg,
                                               Register destination_reg,
                                               bool inline_fastpath) {
   // Allocate an executable page of memory.
-  size_t actual_size = 2 * Assembler::kMinimalBufferSize;
+  size_t actual_size = 4 * Assembler::kMinimalBufferSize;
   byte* buffer = static_cast<byte*>(OS::Allocate(actual_size,
                                                  &actual_size,
                                                  true));
   CHECK(buffer);
   HandleScope handles(isolate);
   MacroAssembler masm(isolate, buffer, static_cast<int>(actual_size));
   DoubleToIStub stub(isolate, source_reg, destination_reg, 0, true,
                      inline_fastpath);
 
   byte* start = stub.GetCode()->instruction_start();
@@ skipping 121 matching lines @@
                                         false));
       RunAllTruncationTests(
           RunGeneratedCodeCallWrapper,
           MakeConvertDToIFuncTrampoline(isolate,
                                         source_registers[s],
                                         dest_registers[d],
                                         true));
     }
   }
 }