RFR(S): 8149463 - [jittester] rarely generates tests with compile error

[Dmitrij Pochepko]

Hi,

please review fix for 8149463 - [jittester] rarely generates tests with 
compile error

A reason for incorrect code generation was "removeSelf" method, which is 
called when IR tree is cut to meet constraints. This method is 
implemented in all loops to not remove node loop completely, but leave 
some of node content instead("header" and "initialization". In this 
specific order.) So, incorrect code was generated in case header code 
used some variable declared in initialization block, thus, leading to 
variable usage before declaration. So, this patch fixes this problem. 
Also, minor code improvement: instead of removing self(loop node), it's 
overwritten with "initialization" block and then a header content is added.

webrev: http://cr.openjdk.java.net/~dpochepk/8149463/webrev.01/
CR: https://bugs.openjdk.java.net/browse/JDK-8149463

I've tested this fix using linux_x64.

Thanks,
Dmitrij
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