Use '=default' to define trivial constructor/destructors

https://clang.llvm.org/extra/clang-tidy/checks/modernize/use-equals-default.html

PiperOrigin-RevId: 526079054
Change-Id: Ia4db21e3e5f58b90de05d52fd94b291ed06d785d

googlemock/test/gmock-matchers-arithmetic_test.cc

@@ -955,7 +955,7 @@ TEST(AllArgsTest, WorksForNonTuple) {
 
 class AllArgsHelper {
  public:
-  AllArgsHelper() {}
+  AllArgsHelper() = default;
 
   MOCK_METHOD2(Helper, int(char x, int y));
 
@@ -976,7 +976,7 @@ TEST(AllArgsTest, WorksInWithClause) {
 
 class OptionalMatchersHelper {
  public:
-  OptionalMatchersHelper() {}
+  OptionalMatchersHelper() = default;
 
   MOCK_METHOD0(NoArgs, int());