Implement private discriminator lookup for debug map symbol files. #674
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It turns out that this wasn;t implemented at all and the existing
tests were working by coincidence because RegisterAllVariables() also
injects local copies of global variables, which bypasses the
discriminator matching. After properly implementing discriminator
support a couple of additional bugs got uncovered which should all be
fixed by this commit and the matching Swift compiler update to
serialize the isTopLevelGlobal bit on VarDecls.
rdar://problem/58846302