Fix R8 warnings (#3090)

Fixes #3058

Author: dkhalanskyjb

kotlinx-coroutines-core/jvm/resources/META-INF/com.android.tools/proguard/coroutines.pro

@@ -22,3 +22,10 @@
 -dontwarn sun.misc.SignalHandler
 -dontwarn java.lang.instrument.Instrumentation
 -dontwarn sun.misc.Signal
+
+# Only used in `kotlinx.coroutines.internal.ExceptionsConstructor`.
+# The case when it is not available is hidden in a `try`-`catch`, as well as a check for Android.
+-dontwarn java.lang.ClassValue
+
+# An annotation used for build tooling, won't be directly accessed.
+-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement

kotlinx-coroutines-core/jvm/resources/META-INF/com.android.tools/r8/coroutines.pro

@@ -18,3 +18,10 @@
 -dontwarn sun.misc.SignalHandler
 -dontwarn java.lang.instrument.Instrumentation
 -dontwarn sun.misc.Signal
+
+# Only used in `kotlinx.coroutines.internal.ExceptionsConstructor`.
+# The case when it is not available is hidden in a `try`-`catch`, as well as a check for Android.
+-dontwarn java.lang.ClassValue
+
+# An annotation used for build tooling, won't be directly accessed.
+-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement

kotlinx-coroutines-core/jvm/resources/META-INF/proguard/coroutines.pro

@@ -22,3 +22,10 @@
 -dontwarn sun.misc.SignalHandler
 -dontwarn java.lang.instrument.Instrumentation
 -dontwarn sun.misc.Signal
+
+# Only used in `kotlinx.coroutines.internal.ExceptionsConstructor`.
+# The case when it is not available is hidden in a `try`-`catch`, as well as a check for Android.
+-dontwarn java.lang.ClassValue
+
+# An annotation used for build tooling, won't be directly accessed.
+-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement