[ia32][nowasm] Fix compilation

Fix ia32 for v8_enable_webassembly=false.
This is not a configuration that we test on CQ or the waterfall, but
it was working at some point so this CL makes it compile again.

R=zhin@chromium.org

Change-Id: I78dafe08199c89ec24613a62a3085e923a51b43e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3056450Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75953}

src/compiler/backend/ia32/instruction-selector-ia32.cc

@@ -2989,9 +2989,6 @@ void InstructionSelector::VisitI8x16Shuffle(Node* node) {
   }
   Emit(opcode, 1, &dst, input_count, inputs, temp_count, temps);
 }
-#else
-void InstructionSelector::VisitI8x16Shuffle(Node* node) { UNREACHABLE(); }
-#endif  // V8_ENABLE_WEBASSEMBLY
 
 void InstructionSelector::VisitI8x16Swizzle(Node* node) {
   InstructionCode op = kIA32I8x16Swizzle;
@@ -3012,6 +3009,10 @@ void InstructionSelector::VisitI8x16Swizzle(Node* node) {
        g.UseRegister(node->InputAt(0)), g.UseRegister(node->InputAt(1)),
        arraysize(temps), temps);
 }
+#else
+void InstructionSelector::VisitI8x16Shuffle(Node* node) { UNREACHABLE(); }
+void InstructionSelector::VisitI8x16Swizzle(Node* node) { UNREACHABLE(); }
+#endif  // V8_ENABLE_WEBASSEMBLY
 
 namespace {
 void VisitPminOrPmax(InstructionSelector* selector, Node* node,