Fix warnings in stdlib/compiler/plugins/test code

libraries/stdlib/common/src/kotlin/ExceptionsH.kt

@@ -146,6 +146,7 @@ public expect fun Throwable.printStackTrace(): Unit
  * suppressed in order to deliver this exception.
  */
 @SinceKotlin("1.4")
+@Suppress("EXTENSION_SHADOWED_BY_MEMBER")
 public expect fun Throwable.addSuppressed(exception: Throwable)
 
 /**
@@ -157,4 +158,4 @@ public expect fun Throwable.addSuppressed(exception: Throwable)
  * - if this [Throwable] instance has disabled the suppression.
  */
 @SinceKotlin("1.4")
-public expect val Throwable.suppressedExceptions: List<Throwable>
+public expect val Throwable.suppressedExceptions: List<Throwable>

libraries/stdlib/common/src/kotlin/JvmAnnotationsH.kt

@@ -107,6 +107,7 @@ public expect annotation class JvmWildcard()
  * Adding and removing the annotation is binary incompatible change, since inline classes' methods and functions with inline classes
  * in their signature are mangled.
  */
+@Suppress("NEWER_VERSION_IN_SINCE_KOTLIN")
 @Target(CLASS)
 @MustBeDocumented
 @SinceKotlin("1.5")
@@ -116,6 +117,7 @@ public expect annotation class JvmInline()
 /**
  * Instructs compiler to mark the class as a record and generate relevant toString/equals/hashCode methods
  */
+@Suppress("NEWER_VERSION_IN_SINCE_KOTLIN")
 @Target(AnnotationTarget.CLASS)
 @MustBeDocumented
 @OptionalExpectation