[flang] Preserve useResultSymbolShape_ option when folding array constructor shape

By default evaluate::GetShape(expr) may return a compiler generated expression
using symbols that are part of function interfaces if there are function
references in "expr".
It is not right to replace an inquiry of "expr" with such compiler
generated expression since the call context would be lost, along with
the meaning of the inquiry expression.
Inquiry folding uses GetContextFreeShape(expr) that sets-up
useResultSymbolShape_ in GetShapeHelper to prevent such bad rewrites. But this did not
work properly with array constructor: GetShapeHelper made a call to
GetShape, ignoring and losing the "useResultSymbolShape_" instruction.

Differential Revision: https://reviews.llvm.org/D144512

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