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[analyzer] Fix a crash when an ObjC object is constructed in AllocaRegion.

Description

[analyzer] Fix a crash when an ObjC object is constructed in AllocaRegion.

Memory region allocated by alloca() carries no implicit type information.
Don't crash when resolving the init message for an Objective-C object
that is being constructed in such region.

rdar://problem/32517077

Differential Revision: https://reviews.llvm.org/D33828