Call getSuppressed() directly.

We dropped support for Java 7 long ago, and we've required API Level 19 (nowadays 21: cl/628429745), which is enough for [Android support](https://developer.android.com/reference/java/lang/Throwable#getSuppressed()), for a while now, too.

RELNOTES=n/a
PiperOrigin-RevId: 686712422

core/src/main/java/com/google/common/truth/Platform.java

@@ -55,27 +55,6 @@ static boolean containsMatch(String actual, String regex) {
     return Pattern.compile(regex).matcher(actual).find();
   }
 
-  /**
-   * Returns an array containing all the exceptions that were suppressed to deliver the given
-   * exception. If suppressed exceptions are not supported (pre-Java 1.7), an empty array will be
-   * returned.
-   */
-  static Throwable[] getSuppressed(Throwable throwable) {
-    try {
-      Method getSuppressed = throwable.getClass().getMethod("getSuppressed");
-      return (Throwable[]) checkNotNull(getSuppressed.invoke(throwable));
-    } catch (NoSuchMethodException e) {
-      return new Throwable[0];
-    } catch (IllegalAccessException e) {
-      // We're calling a public method on a public class.
-      throw newLinkageError(e);
-    } catch (InvocationTargetException e) {
-      throwIfUnchecked(e.getCause());
-      // getSuppressed has no `throws` clause.
-      throw newLinkageError(e);
-    }
-  }
-
   static void cleanStackTrace(Throwable throwable) {
     StackTraceCleaner.cleanStackTrace(throwable);
   }

core/src/main/java/com/google/common/truth/StackTraceCleaner.java

@@ -151,7 +151,7 @@ private void clean(Set<Throwable> seenThrowables) {
     if (throwable.getCause() != null) {
       new StackTraceCleaner(throwable.getCause()).clean(seenThrowables);
     }
-    for (Throwable suppressed : Platform.getSuppressed(throwable)) {
+    for (Throwable suppressed : throwable.getSuppressed()) {
       new StackTraceCleaner(suppressed).clean(seenThrowables);
     }
   }

core/src/main/java/com/google/common/truth/super/com/google/common/truth/Platform.java

@@ -59,14 +59,6 @@ static boolean containsMatch(String subject, String regex) {
     return compile(regex).test(subject);
   }
 
-  /**
-   * Returns an array containing all the exceptions that were suppressed to deliver the given
-   * exception. Delegates to the getSuppressed() method on Throwable that is available in Java 1.7+
-   */
-  static Throwable[] getSuppressed(Throwable throwable) {
-    return throwable.getSuppressed();
-  }
-
   static void cleanStackTrace(Throwable throwable) {
     // Do nothing. See notes in StackTraceCleanerTest.
   }