Summary: Fixed invalid casts in address computation
Reviewed-by: kvn, never
Contributed-by: thomas.salter@unisys.com

Summary: The code incorrectly used is_instptr() instead of is_oopptr() to get const_oop.
Reviewed-by: never

Summary: Replace the assert in PhiNode::Ideal with check to avoid transformation of new phi.
Reviewed-by: never

Summary: New limit for unrolled loop should be set only for zero trip guard and loop iteration test.
Reviewed-by: never

Summary: Missing fail flag set in strings concatenation code.
Reviewed-by: never

Summary: Update the HS21 build number to 14
Reviewed-by: jcoomes