10306 mdb: NULL pointer errors
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Gergő Mihály Doma <domag02@gmail.com>
Approved by: Dan McDonald <danmcd@joyent.com>

merge with onnv_147
Reviewed by: garrett@nexenta.com
Approved by: garrett@nexenta.com

6679140 asymmetric alloc/dealloc activity can induce dynamic variable drops
6679193 dtrace_dynvar walker produces flood of dtrace_dynhash_sink
6935550 would like ::stacks for user-land
6970441 alloca

6679140 asymmetric alloc/dealloc activity can induce dynamic variable drops
6679193 dtrace_dynvar walker produces flood of dtrace_dynhash_sink
6935550 would like ::stacks for user-land
6970441 allocation failure can induce crashes in libdtrace
6971885 dtrace_program_strcompile() fails spuriously on UTF-8 input

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