RFR (S): 8234586: Rename survRateGroup.?pp files to g1SurvRateGroup.?pp

[Thomas Schatzl]

Hi all,

   can I have reviews for this rename of the survRateGroup* files to 
g1SurvRateGroup* to follow the naming convention of (most) other G1 
specific files?

Based on JDK-8233588.

CR:
https://bugs.openjdk.java.net/browse/JDK-8234586
Webrev:
http://cr.openjdk.java.net/~tschatzl/8234586/webrev/
Testing:
local compilation

Thanks,
   Thomas