6703890: Compressed Oops: add LoadNKlass node to generate narrow oops (32-bits) compare instructions
Summary: Add LoadNKlass and CMoveN nodes, use CmpN and ConN nodes to generate narrow oops compare instructions.
Reviewed-by: never, rasbold

Summary: fix several problems in C2 related to Escape Analysis and Compressed Oops.
Reviewed-by: never, jrose

Summary: 64-bits VM crashes with -XX:+AggresiveOpts (Escape Analysis + Compressed Oops)
Reviewed-by: never, sgoldman

Summary: Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv
Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold

Summary: C2 spends > 60% in escape analysis code during test nsk/regression/b4675027.
Reviewed-by: never

Summary: The assert misses the case CastX2P 'base' for an unsafe field reference
Reviewed-by: never, jrose

Summary: Current EA code has several problems which have to be fixed.
Reviewed-by: jrose, sgoldman

Summary: Cloning an allocation will not allow scalar replacement since memory operations could not be associated with one allocation.
Reviewed-by: rasbold

Summary: During split unique types EA could exceed nodes limit and fail the method compilation.
Reviewed-by: rasbold