Summary: I have collected some typos I have found while looking at the code.
Reviewed-by: kvn, never

Summary: Update for files that have been modified starting July 2008
Reviewed-by: ohair, tbell

Summary: Push DecodeN node below the Null check to the non-null path to use the mach node without 0 test.
Reviewed-by: rasbold, never

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