Fix MSVC C4065 warning in HasMemoryAccessMode().

Avoid generating switch statements with only a default case. Instead,
when there are no instructions that can trap, simply have
HasMemoryAccessMode() return false. This avoids a MSVC warning when
doing a 32-bit build.

To do this, remove empty TARGET_ARCH_OPCODE_WITH_MEMORY_ACCESS_MODE_LIST
definitions from instruction-codes-$arch.h files.

Change-Id: Ifed76eb9cbca169f30c188c1999e1e9be0b2c6aa
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3224807Reviewed-by: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77441}

src/compiler/backend/instruction-codes.h

@@ -315,6 +315,7 @@ using AccessModeField = base::BitField<MemoryAccessMode, 30, 2>;
 // scary. {HasMemoryAccessMode} does not include these instructions, so they can
 // be easily found by guarding encoding.
 inline bool HasMemoryAccessMode(ArchOpcode opcode) {
+#if defined(TARGET_ARCH_OPCODE_WITH_MEMORY_ACCESS_MODE_LIST)
   switch (opcode) {
 #define CASE(Name) \
   case k##Name:    \
@@ -324,6 +325,9 @@ inline bool HasMemoryAccessMode(ArchOpcode opcode) {
     default:
       return false;
   }
+#else
+  return false;
+#endif
 }
 
 using DeoptImmedArgsCountField = base::BitField<int, 22, 2>;