Throw exceptions when run jacoco task

Gradle versin:
```
huanghaohang@huanghaohang-desktop:/workspace/project/iop-android$ ./gradlew -version
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.codehaus.groovy.reflection.CachedClass (file:/home/huanghaohang/.gradle/wrapper/dists/gradle-4.6-all/bcst21l2brirad8k2ben1letg/gradle-4.6/lib/groovy-all-2.4.12.jar) to method java.lang.Object.finalize()
WARNING: Please consider reporting this to the maintainers of org.codehaus.groovy.reflection.CachedClass
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

------------------------------------------------------------
Gradle 4.6
------------------------------------------------------------

Build time: 2018-02-28 13:36:36 UTC
Revision: 8fa6ce7945b640e6168488e4417f9bb96e4ab46c

Groovy: 2.4.12
Ant: Apache Ant(TM) version 1.9.9 compiled on February 2 2017
JVM: 10.0.1 (Oracle Corporation 10.0.1+10-Ubuntu-3ubuntu1)
OS: Linux 4.15.0-23-generic amd64
```

Log:
```
> Task :app:testOfficialDebugUnitTest
Exception in thread "main" java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at java.instrument/sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:510)
at java.instrument/sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:522)
Caused by: java.lang.RuntimeException: Class java/lang/UnknownError could not be instrumented.
at org.jacoco.agent.rt.internal_290345e.core.runtime.ModifiedSystemClassRuntime.createFor(ModifiedSystemClassRuntime.java:139)
at org.jacoco.agent.rt.internal_290345e.core.runtime.ModifiedSystemClassRuntime.createFor(ModifiedSystemClassRuntime.java:100)
FATAL ERROR in native method: processing of -javaagent failed
at org.jacoco.agent.rt.internal_290345e.PreMain.createRuntime(PreMain.java:55)
at org.jacoco.agent.rt.internal_290345e.PreMain.premain(PreMain.java:47)
... 6 more
Caused by: java.lang.NoSuchFieldException: $jacocoAccess
at java.base/java.lang.Class.getField(Class.java:1958)
at org.jacoco.agent.rt.internal_290345e.core.runtime.ModifiedSystemClassRuntime.createFor(ModifiedSystemClassRuntime.java:137)
... 9 more
Exception in thread "main" java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at java.instrument/sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:510)
at java.instrument/sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:522)
Caused by: java.lang.RuntimeException: Class java/lang/UnknownError could not be instrumented.
at org.jacoco.agent.rt.internal_290345e.core.runtime.ModifiedSystemClassRuntime.createFor(ModifiedSystemClassRuntime.java:139)
at org.jacoco.agent.rt.internal_290345e.core.runtime.ModifiedSystemClassRuntime.createFor(ModifiedSystemClassRuntime.java:100)
at org.jacoco.agent.rt.internal_290345e.PreMain.createRuntime(PreMain.java:55)
at org.jacoco.agent.rt.internal_290345e.PreMain.premain(PreMain.java:47)
... 6 more
Caused by: java.lang.NoSuchFieldException: $jacocoAccess
at java.base/java.lang.Class.getField(Class.java:1958)
at org.jacoco.agent.rt.internal_290345e.core.runtime.ModifiedSystemClassRuntime.createFor(ModifiedSystemClassRuntime.java:137)
... 9 more
FATAL ERROR in native method: processing of -javaagent failed
Process 'Gradle Test Executor 7' finished with non-zero exit value 134
org.gradle.process.internal.ExecException: Process 'Gradle Test Executor 7' finished with non-zero exit value 134
at org.gradle.process.internal.DefaultExecHandle$ExecResultImpl.assertNormalExitValue(DefaultExecHandle.java:389)
at org.gradle.process.internal.worker.DefaultWorkerProcess.onProcessStop(DefaultWorkerProcess.java:124)
at org.gradle.process.internal.worker.DefaultWorkerProcess.access$000(DefaultWorkerProcess.java:41)
at org.gradle.process.internal.worker.DefaultWorkerProcess$1.executionFinished(DefaultWorkerProcess.java:80)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
at org.gradle.internal.event.AbstractBroadcastDispatch.dispatch(AbstractBroadcastDispatch.java:42)
at org.gradle.internal.event.BroadcastDispatch$SingletonDispatch.dispatch(BroadcastDispatch.java:230)
at org.gradle.internal.event.BroadcastDispatch$SingletonDispatch.dispatch(BroadcastDispatch.java:149)
at org.gradle.internal.event.ListenerBroadcast.dispatch(ListenerBroadcast.java:140)
at org.gradle.internal.event.ListenerBroadcast.dispatch(ListenerBroadcast.java:37)
at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:93)
at com.sun.proxy.$Proxy115.executionFinished(Unknown Source)
at org.gradle.process.internal.DefaultExecHandle.setEndStateInfo(DefaultExecHandle.java:207)
at org.gradle.process.internal.DefaultExecHandle.finished(DefaultExecHandle.java:334)
at org.gradle.process.internal.ExecHandleRunner.completed(ExecHandleRunner.java:102)
at org.gradle.process.internal.ExecHandleRunner.run(ExecHandleRunner.java:82)
at org.gradle.internal.operations.BuildOperationIdentifierPreservingRunnable.run(BuildOperationIdentifierPreservingRunnable.java:39)
at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63)
at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
at java.base/java.lang.Thread.run(Thread.java:844)
...
```

Reproduce the failure with Gradle 4.6, JVM 10, and the :app:testOfficialDebugUnitTest task. Read the JaCoCo agent failure around ModifiedSystemClassRuntime and the reported $jacocoAccess error; done means the test task and JaCoCo run complete without the non-zero exit or agent exception.

Written by the indexing model from the issue text.