RFR(XS): 8166806: Add intrinsic support for writer used in event based tracing

[Vladimir Kozlov]

Hi Markus,

Where _getBufferWriter is defined? I don't see closed changes.

c1_LIRGenerator.cpp: should you use oopConst(NULL) in compare?

library_call.cpp: TypeInstPtr::MIRROR is useless since the result phi 
type is TypePtr::BOTTOM. Using TypePtr::BOTTOM for load could be less 
bug prone.

Thanks,
Vladimir

On 9/27/16 1:58 PM, Markus Gronlund wrote:
> Greetings,
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> Kindly asking for reviews for the following change:
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> Bug: http://bugs.openjdk.java.net/browse/JDK-8166806
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> Webrev: http://cr.openjdk.java.net/~mgronlun/8166806/webrev/
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> Thanks in advance
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> Markus
>