Be explicit about whether a DebugInfo-carying SILInstruction has debug info #14767
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This patch both makes debug variable information it optional on
alloc_stack and alloc_box instructions, and forced variable
information on debug_value and debug_value_addr instructions. The
change of the interface uncovered a plethora of bugs in SILGen,
SILTransform, and IRGen's LoadableByAddress pass.
Most importantly this fixes the previously commented part of the
DebugInfo/local-vars.swift.gyb testcase.
rdar://problem/37720555