8144979: Context.fromClass should catch exception from Class.getClassLoader call
Reviewed-by: attila, mhaupt
# buffer indexing linker example
/*
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// This script assumes you've built jdk9 or using latest
// jdk9 image and put the 'bin' directory in the PATH
$EXEC.throwOnError=true
// compile BufferIndexingLinkerExporter
`javac -cp ../../dist/nashorn.jar BufferIndexingLinkerExporter.java`
// make a jar file out of pluggable linker
`jar cvf buffer_indexing_linker.jar BufferIndexingLinkerExporter*.class META-INF/`
// run a sample script that uses pluggable linker
// but make sure classpath points to the pluggable linker jar!
`jjs -cp buffer_indexing_linker.jar buffer_index.js`
print($OUT)