Review request for backport of JDK-8144020: Remove long as an internal numeric type

[Hannes Wallnoefer]

Please review backport to 8u-dev of JDK-8144020: Remove long as an 
internal numeric type:

http://cr.openjdk.java.net/~hannesw/8144020/webrev-8u/

There was some manual merging necessary in the following files:

src/jdk/nashorn/internal/codegen/LocalVariableTypesCalculator.java
src/jdk/nashorn/internal/codegen/SpillObjectCreator.java
src/jdk/nashorn/internal/ir/debug/NashornTextifier.java
src/jdk/nashorn/internal/objects/NativeArray.java
src/jdk/nashorn/internal/parser/Lexer.java
src/jdk/nashorn/internal/runtime/JSType.java
src/jdk/nashorn/internal/runtime/OptimisticReturnFilters.java
src/jdk/nashorn/internal/runtime/ScriptObject.java
src/jdk/nashorn/internal/runtime/arrays/LongArrayData.java

I chose to omit the changes to ir/debug/NashornTextifier.java and 
runtime/linker/NashornCallSiteDescriptor.java (cleaning up bytecode 
printing) as it is not an essential part of this patch and would have 
required more changes in NashornTextifier.java.

Thanks
Hannes