[tree-ssa] Out of SSA status and issues

[Richard Kenner]

    Consider instead that '*p' is just the name given a register's
    contents.  Neither 'i' nor '9' are processor internal.  Both are
    external to the cpu.  The memory reference for 'i' is source code
    implicit, the memory reference for '*p' is source code explicit.  

True, but given caching effects, it's hard to see how *p could be less
expensive than 'i'.