Request for reviews (S): 6889656: assert(lo_lrg->lo_degree() || !lo_no_simplify,"Live range was lo-degree before coalesce

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/6889656/webrev.00

Fixed 6889656: assert(lo_lrg->lo_degree() || !lo_no_simplify,"Live range was lo-degree before coalesce

Problem:
Because of initial loop's "i" value change in 6875959 fix
the first _hi_degree lrg was not checked for lo_degree().

Solution:
Restore the original code: uint i = _hi_degree.
I also cached calculation of live ranges.

Reviewed by:

Fix verified (y/n): y, bug's test

Other testing:
JPRT