[wasm] Remove obsolete CheckHasMemoryForAtomics

This function is equivalent to CheckHasMemory by now.

R=clemensb@chromium.org

Bug: v8:11074
Change-Id: I05fbd160d6e5b8d7433133052a8390521564632b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2509590Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70896}

src/wasm/function-body-decoder-impl.h

@@ -2180,16 +2180,6 @@ class WasmFullDecoder : public WasmDecoder<validate> {
     return true;
   }
 
-  bool CheckHasMemoryForAtomics() {
-    if (CheckHasMemory()) return true;
-    if (!VALIDATE(this->module_->has_shared_memory)) {
-      this->DecodeError(this->pc_ - 1,
-                        "Atomic opcodes used without shared memory");
-      return false;
-    }
-    return true;
-  }
-
   bool CheckSimdPostMvp(WasmOpcode opcode) {
     if (!FLAG_wasm_simd_post_mvp && WasmOpcodes::IsSimdPostMvpOpcode(opcode)) {
       this->DecodeError(
@@ -4061,7 +4051,7 @@ class WasmFullDecoder : public WasmDecoder<validate> {
         this->DecodeError("invalid atomic opcode");
         return 0;
     }
-    if (!CheckHasMemoryForAtomics()) return 0;
+    if (!CheckHasMemory()) return 0;
     MemoryAccessImmediate<validate> imm(
         this, this->pc_ + opcode_length,
         ElementSizeLog2Of(memtype.representation()));