remove implicit fallthroughs (#1194) (#1196)

Author: Jeremy Day

src/tools/translate-to-fuzz.h

@@ -639,9 +639,17 @@ class TranslateToFuzzReader {
           }
         }
         switch (conditions) {
-          case 0: if (!oneIn(4)) continue;
-          case 1: if (!oneIn(2)) continue;
-          default: if (oneIn(conditions + 1)) continue;
+          case 0: {
+            if (!oneIn(4)) continue;
+            break;
+          }
+          case 1: {
+            if (!oneIn(2)) continue;
+            break;
+          }
+          default: {
+            if (oneIn(conditions + 1)) continue;
+          }
         }
         return builder.makeBreak(name);
       }

src/wasm/wasm-s-parser.cpp

@@ -874,6 +874,7 @@ Expression* SExpressionWasmBuilder::makeExpression(Element& s) {
       }
       case 'w': {
         if (!strncmp(str, "wake", strlen("wake"))) return makeAtomicWake(s);
+        abort_on(str);
       }
       default: abort_on(str);
     }