[wasm] WIP fix arm64 frame alignment.

src/arm64/macro-assembler-arm64.h

 // 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.
 
 #ifndef V8_ARM64_MACRO_ASSEMBLER_ARM64_H_
 #define V8_ARM64_MACRO_ASSEMBLER_ARM64_H_
 
 #include <vector>
 
 #include "src/arm64/assembler-arm64.h"
@@ skipping 770 matching lines @@
   // it can be evidence of a potential bug because the ABI forbids accesses
   // below csp.
   //
   // If StackPointer() is the system stack pointer (csp), then csp will be
   // dereferenced to cause the processor (or simulator) to abort if it is not
   // properly aligned.
   //
   // If emit_debug_code() is false, this emits no code.
   void AssertStackConsistency();
 
+  // Emits a runtime assert that the CSP is aligned.
+  void AssertCspAligned();
+
   // Preserve the callee-saved registers (as defined by AAPCS64).
   //
   // Higher-numbered registers are pushed before lower-numbered registers, and
   // thus get higher addresses.
   // Floating-point registers are pushed before general-purpose registers, and
   // thus get higher addresses.
   //
   // Note that registers are not checked for invalid values. Use this method
   // only if you know that the GC won't try to examine the values on the stack.
   //
@@ skipping 1468 matching lines @@
 #error "Unsupported option"
 #define CODE_COVERAGE_STRINGIFY(x) #x
 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 #endif  // V8_ARM64_MACRO_ASSEMBLER_ARM64_H_