6791815: Fix for 6471657 can cause deadlock on non-Solaris platforms when initializing direct buffer support
Summary: Place the state transition inside the loop so that the VMThread could proceed for safepoint
Reviewed-by: dholmes, never, acorn

Summary: Make reguard_stack change access to RW, not execute and use os::protect_memory with the new parameter when change needed to X.
Reviewed-by: acorn, jcoomes

Summary: allocate alignment-sized page(s) below java heap so that memory accesses at heap_base+1page give signal and cause an implicit null check
Reviewed-by: kvn, jmasa, phh, jcoomes

Summary: Update copyright year for files that have been modified in 2008
Reviewed-by: ohair, tbell

Summary: This fix enables the generation of core file when process runs out of C-heap.
Reviewed-by: sbohne

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