[9] RFR (S): 8029305: add type tag to AbstractCompiler

[Christian Thalinger]

https://bugs.openjdk.java.net/browse/JDK-8029305
http://cr.openjdk.java.net/~twisti/8029305

8029305: add type tag to AbstractCompiler
Reviewed-by:

Add a closed set of concrete compiler classes. Using an tag like this avoids a confusing use of macros around the definition of the is_<compiler type> methods.

As a followup to this change I’m going to replace nmethod::_compiler with a flags field that stores AbstractCompiler::Type values instead:

[#JDK-8031211] replace nmethod::_compiler with a flags field that stores AbstractCompiler::Type values instead

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