Consistent hashCode for Symbol.
Consistent hashCode for Symbol.

Use the string's hashcode so it is stable across jvm restarts. Closes
SI-5056, no review.


jvican/scala,martijnhoekstra/scala,shimib/scala,scala/scala,slothspot/scala,shimib/scala,felixmulder/scala,scala/scala,lrytz/scala,felixmulder/scala,jvican/scala,scala/scala,felixmulder/scala,scala/scala,shimib/scala,jvican/scala,lrytz/scala,jvican/scala,slothspot/scala,scala/scala,lrytz/scala,lrytz/scala,shimib/scala,jvican/scala,felixmulder/scala,jvican/scala,slothspot/scala,slothspot/scala,lrytz/scala,jvican/scala,slothspot/scala,shimib/scala,martijnhoekstra/scala,martijnhoekstra/scala,felixmulder/scala,shimib/scala,martijnhoekstra/scala,scala/scala,felixmulder/scala,slothspot/scala,slothspot/scala,martijnhoekstra/scala,lrytz/scala,martijnhoekstra/scala,felixmulder/scala