[CIR] Backport a fix for array element destruction order. #1823
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Previously, when an array of destructible object went out of scope, the object destructors were called in the same order that they were constructed. This is incorrect. The objects should be destructed in reverse order. This change fixes that. This fixes llvm#1759
I made a separate initial commit expanding the array-init-destroy.cpp test checks to show the array destruction loop before my changes.
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Previously, when an array of destructible object went out of scope, the object destructors were called in the same order that they were constructed. This is incorrect. The objects should be destructed in reverse order. This change fixes that.
This fixes #1759