replace fallthrough statements with case clause lists

Found using https://go-critic.github.io/overview#emptyFallthrough-ref

Author: quasilyte

language/parser/parser.go

@@ -601,9 +601,7 @@ func parseValueLiteral(parser *Parser, isConst bool) (ast.Value, error) {
 			Value: token.Value,
 			Loc:   loc(parser, token.Start),
 		}), nil
-	case lexer.TokenKind[lexer.BLOCK_STRING]:
-		fallthrough
-	case lexer.TokenKind[lexer.STRING]:
+	case lexer.TokenKind[lexer.BLOCK_STRING], lexer.TokenKind[lexer.STRING]:
 		return parseStringLiteral(parser)
 	case lexer.TokenKind[lexer.NAME]:
 		if token.Value == "true" || token.Value == "false" {

type_info.go

@@ -206,11 +206,7 @@ func (ti *TypeInfo) Leave(node ast.Node) {
 		}
 	case kinds.Directive:
 		ti.directive = nil
-	case kinds.OperationDefinition:
-		fallthrough
-	case kinds.InlineFragment:
-		fallthrough
-	case kinds.FragmentDefinition:
+	case kinds.OperationDefinition, kinds.InlineFragment, kinds.FragmentDefinition:
 		// pop ti.typeStack
 		if len(ti.typeStack) > 0 {
 			_, ti.typeStack = ti.typeStack[len(ti.typeStack)-1], ti.typeStack[:len(ti.typeStack)-1]
@@ -226,9 +222,7 @@ func (ti *TypeInfo) Leave(node ast.Node) {
 		if len(ti.inputTypeStack) > 0 {
 			_, ti.inputTypeStack = ti.inputTypeStack[len(ti.inputTypeStack)-1], ti.inputTypeStack[:len(ti.inputTypeStack)-1]
 		}
-	case kinds.ListValue:
-		fallthrough
-	case kinds.ObjectField:
+	case kinds.ListValue, kinds.ObjectField:
 		// pop ti.inputTypeStack
 		if len(ti.inputTypeStack) > 0 {
 			_, ti.inputTypeStack = ti.inputTypeStack[len(ti.inputTypeStack)-1], ti.inputTypeStack[:len(ti.inputTypeStack)-1]

util.go

@@ -75,17 +75,9 @@ func getGraphType(tipe reflect.Type) Output {
 	switch kind {
 	case reflect.String:
 		return String
-	case reflect.Int:
-		fallthrough
-	case reflect.Int8:
-		fallthrough
-	case reflect.Int32:
-		fallthrough
-	case reflect.Int64:
+	case reflect.Int, reflect.Int8, reflect.Int32, reflect.Int64:
 		return Int
-	case reflect.Float32:
-		fallthrough
-	case reflect.Float64:
+	case reflect.Float32, reflect.Float64:
 		return Float
 	case reflect.Bool:
 		return Boolean
@@ -98,19 +90,11 @@ func getGraphType(tipe reflect.Type) Output {
 func getGraphList(tipe reflect.Type) *List {
 	if tipe.Kind() == reflect.Slice {
 		switch tipe.Elem().Kind() {
-		case reflect.Int:
-			fallthrough
-		case reflect.Int8:
-			fallthrough
-		case reflect.Int32:
-			fallthrough
-		case reflect.Int64:
+		case reflect.Int, reflect.Int8, reflect.Int32, reflect.Int64:
 			return NewList(Int)
 		case reflect.Bool:
 			return NewList(Boolean)
-		case reflect.Float32:
-			fallthrough
-		case reflect.Float64:
+		case reflect.Float32, reflect.Float64:
 			return NewList(Float)
 		case reflect.String:
 			return NewList(String)