v2.15.2

Cthulhu v2.15.2

Diff since v2.15.1

Merged pull requests:

• don't descend into cglobal and llvmcall (#602) (@simeonschaub)
• always show total inlining cost when inline_cost=true (#607) (@aviatesk)

Closed issues:

• internal assertion error examining BigInt() constructor (#515)
• ERROR: TypeError: in typeassert, expected Symbol, got a value of type Nothing (#606)