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

Summary: The method Node::dominates loops in the dead code which does not have a Region node.
Reviewed-by: jrose, never

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

Summary: Optimization in CmpPNode::sub() removed the valid compare instruction because of false positive answer from detect_dominating_control().
Reviewed-by: jrose, sgoldman

Summary: Optimization in CmpPNode::sub() removed the valid compare instruction because of false positive answer from detect_dominating_control().
Reviewed-by: jrose, 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: missing check in LoadNode::Ideal() causes infinite generation of a value Phi.
Reviewed-by: jrose, never

Summary: EA gives opportunite to do more aggressive memory optimizations.
Reviewed-by: never, jrose

Summary: ClearArrayNode::Identity should use TypeX instead of TypeInt
Reviewed-by: jrose, kvn, sgoldman

Summary: Avoid an infinite generation of instance's field values Phi nodes.
Reviewed-by: never

Summary: C2 crashed in StoreCMNode::Value because n->in(MemNode::OopStore) is 0.
Reviewed-by: rasbold, never

Summary: this optimization causes problems (sizes of Load and Store nodes do not match) for objects initialization code and Escape Analysis
Reviewed-by: jrose, never

Summary: T_ADDRESS size is defined as 'int' size (4 bytes) but C2 use it for raw pointers and as memory type for StoreP and LoadP nodes.
Reviewed-by: jrose

Reviewed-by: kvn, rasbold