Request for review(M): 7009231: C1: Incorrect CAS code for longs on SPARC 32bit

[Igor Veresov]

Problem: On sparc in 32bit we use the casx instruction and then cmp to 
compare new and old value. That cmp does a 64bit compare. It is followed 
by a cmove the generates a br instruction, which uses only icc. Also, 
this behavior of cmove is incorrect in 64bit, because we always miss 
upper 32bits.

Solution: Add "xcc to icc conversion" when generating cas for longs in 
32bit. Also, propagate the type of comparison to cmove to generate 
proper code in 64bit.

Webrev: http://cr.openjdk.java.net/~iveresov/7009231/webrev.00


Testing: Test that failed, JPRT with tiered in progress.