[mlir][emitc] Use LLVM_FALLTHROUGH

The switch case code was simplified using LLVM_FALLTHROUGH.

Author: EtoAndruwa

mlir/lib/Dialect/EmitC/IR/EmitC.cpp

@@ -17,6 +17,7 @@
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/TypeSwitch.h"
 #include "llvm/Support/Casting.h"
+#include "llvm/Support/Compiler.h"
 
 using namespace mlir;
 using namespace mlir::emitc;
@@ -114,11 +115,10 @@ bool mlir::emitc::isIntegerIndexOrOpaqueType(Type type) {
 bool mlir::emitc::isSupportedFloatType(Type type) {
   if (auto floatType = llvm::dyn_cast<FloatType>(type)) {
     switch (floatType.getWidth()) {
-    case 16: {
-      if (llvm::isa<Float16Type, BFloat16Type>(type))
-        return true;
-      return false;
-    }
+    case 16:
+      if (!llvm::isa<Float16Type, BFloat16Type>(type))
+        return false;
+      LLVM_FALLTHROUGH;
     case 32:
     case 64:
       return true;