Reviewed-by: lana, prr

Reviewed-by: lana

Summary: Switch off EliminateAutoBox flag by default in jdk8 release.
Reviewed-by: iveresov

Reviewed-by: jcoomes

Summary: Restrict loadI2L_imm optimizations to positive values of mask
Reviewed-by: kvn, dlong

Summary: Fix the sizing of loadUS2L_immI16 and loadI2L_immI
Reviewed-by: kvn, azeemj

Reviewed-by: jrose, acorn, hseigel, lfoltan

Reviewed-by: jcoomes

Reviewed-by: kvn, iveresov