[Graal] Tests which run with "--limit-modules java.base" could fail when Graal is used as JIT

The following tests fail in case Graal is used as JIT compiler:
 test/hotspot/jtreg/runtime/SharedArchiveFile/BootAppendTests.java
 test/jdk/java/lang/String/concat/WithSecurityManager.java

Failure example:
 Java(TM) SE Runtime Environment (fastdebug build 10-internal+0-2017-11-07-2227183.ekaterina.pavlova.hs10.consolidated)
Java HotSpot(TM) 64-Bit Server VM (fastdebug build 10-internal+0-2017-11-07-2227183.ekaterina.pavlova.hs10.consolidated, mixed mode, sharing)
jdk.vm.ci.common.JVMCIError: JVMCI compiler 'graal' not found
at jdk.internal.vm.ci/jdk.vm.ci.hotspot.HotSpotJVMCICompilerConfig.getCompilerFactory(HotSpotJVMCICompilerConfig.java:85)
at jdk.internal.vm.ci/jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.<init>(HotSpotJVMCIRuntime.java:290)
at jdk.internal.vm.ci/jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.<init>(HotSpotJVMCIRuntime.java:65)
at jdk.internal.vm.ci/jdk.vm.ci.hotspot.HotSpotJVMCIRuntime$DelayedInit.<clinit>(HotSpotJVMCIRuntime.java:73)
at jdk.internal.vm.ci/jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.runtime(HotSpotJVMCIRuntime.java:83)
at jdk.internal.vm.ci/jdk.vm.ci.runtime.JVMCI.initializeRuntime(Native Method)
at jdk.internal.vm.ci/jdk.vm.ci.runtime.JVMCI.<clinit>(JVMCI.java:58)