Reviewed-by: erikj, dholmes

Summary: Remove Linux kernel version check as very unlikely a kernel older than 2.4 will be used.
Reviewed-by: erikj

8180904: Hotspot tests running with -agentvm failing due to classpath
Summary: Add -cp System.getProperty("java.class.path") to ProcessBuilder arguments.
Reviewed-by: sla, gtriantafill

Reviewed-by: aph, mdoerr

Summary: Introduce alignment-safe Copy::conjoint_swap and JVM_CopySwapMemory
Reviewed-by: mikael, dholmes

Reviewed-by: prr