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

8028764: dtrace/hotspot_jni/ALL/ALL001 crashes the vm on Solaris-amd64, SIGSEGV in MarkSweep::follow_stack()+0x8a
Summary: C1 generates code to encode compressed oop into tmp register before runtime call for patching where GC may happen
Reviewed-by: iveresov, twisti, kvn
Contributed-by: Nmgerdin <mikael.gerdin@oracle.com>

Reviewed-by: jcoomes

Reviewed-by: lana, tbell