Move JvmRuntimeDescriptorLoaderTest to core/descriptors.runtime/tests

This allows to get rid of the dependency on descriptors.runtime from
compiler/IDE tests which is problematic: classes there clash with the
classes in kotlin-reflect, which reference declarations in shadowed
packages

compiler/tests-common/build.gradle.kts

@@ -5,7 +5,6 @@ dependencies {
     testCompile(project(":core:descriptors"))
     testCompile(project(":core:descriptors.jvm"))
     testCompile(project(":core:deserialization"))
-    testCompile(project(":core:descriptors.runtime"))
     testCompile(project(":compiler:util"))
     testCompile(project(":compiler:backend"))
     testCompile(project(":compiler:frontend"))