RFR: 8160748: Inconsistent types for ideal_reg

[Igor Veresov]

Looks good to me.

igor

> On Apr 6, 2017, at 9:48 PM, Kim Barrett <kim.barrett at oracle.com> wrote:
> 
> Please review this change to Type's ideal_reg to make its return type
> consistent with the closely related Node::ideal_reg().  Where Type
> used to be an int, it is now a uint.  This eliminates the implicit
> narrowing conversion in the initialization of _type_info that caused
> build failure for C++11 (gcc with -std=gnu++11 or (not tested, but
> presumed fixed) Visual Studio 2015 or later).
> 
> Also fixed a number of places where the result of Node::ideal_reg()
> was being treated as int rather than uint.
> 
> And since I was in the neighborhood (changing the type of
> Type::TypeInfo::ideal_reg), also fixed Type::_type_info[] to be const
> as apparently intended but not successfully accomplished.  (The msg
> member was writable, forcing allocation of the array to be in writable
> memory, rather than read-only.)
> 
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8160748
> 
> Webrev:
> http://cr.openjdk.java.net/~kbarrett/8160748/hotspot.00/
> 
> Testing:
> JPRT, rbt hs-tier2,hs-tier3,hs-tier4-comp,hs-tier5-comp
>