MIPS[64]: Reland of `Fix unaligned arguments storage in Wasm-to-interpreter entry`

src/wasm/wasm-debug.cc

Index: src/wasm/wasm-debug.cc
diff --git a/src/wasm/wasm-debug.cc b/src/wasm/wasm-debug.cc
index f942c921276433ed033d03517b2cea509479172f..2f3b83a3bf7d27458f443d9040a7c7df06e94085 100644
--- a/src/wasm/wasm-debug.cc
+++ b/src/wasm/wasm-debug.cc
@@ -178,7 +178,7 @@ class InterpreterHandle {
 #define CASE_ARG_TYPE(type, ctype)                                  \
   case type:                                                        \
     DCHECK_EQ(param_size, sizeof(ctype));                           \
-    wasm_args[i] = WasmVal(ReadUnalignedValue<ctype>(arg_buf_ptr)); \
+    wasm_args[i] = WasmVal(*reinterpret_cast<ctype*>(arg_buf_ptr)); \
     break;
       switch (sig->GetParam(i)) {
         CASE_ARG_TYPE(kWasmI32, uint32_t)
@@ -189,7 +189,7 @@ class InterpreterHandle {
         default:
           UNREACHABLE();
       }
-      arg_buf_ptr += param_size;
+      arg_buf_ptr += RoundUpToMultipleOfPowOf2(param_size, 8);
     }
 
     uint32_t activation_id = StartActivation(frame_pointer);
@@ -240,7 +240,7 @@ class InterpreterHandle {
 #define CASE_RET_TYPE(type, ctype)                                       \
   case type:                                                             \
     DCHECK_EQ(1 << ElementSizeLog2Of(sig->GetReturn(0)), sizeof(ctype)); \
-    WriteUnalignedValue<ctype>(arg_buffer, ret_val.to<ctype>());         \
+    *reinterpret_cast<ctype*>(arg_buffer) = ret_val.to<ctype>();         \
     break;
       switch (sig->GetReturn(0)) {
         CASE_RET_TYPE(kWasmI32, uint32_t)