Make operator bool() explicit, and remove explicit from move ctors.

src/common/bitset_utils.h

@@ -35,7 +35,7 @@ class BitSetT final
             mParent->set(mBit, x);
             return *this;
         }
-        operator bool() const { return mParent->test(mBit); }
+        explicit operator bool() const { return mParent->test(mBit); }
 
       private:
         friend class BitSetT;

src/libANGLE/VertexAttribute.h

@@ -23,7 +23,7 @@ class VertexBinding final : angle::NonCopyable
 {
   public:
     VertexBinding();
-    explicit VertexBinding(VertexBinding &&binding);
+    VertexBinding(VertexBinding &&binding);
     VertexBinding &operator=(VertexBinding &&binding);
 
     GLuint getStride() const { return mStride; }