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In constructAbstractSubprogramScopeDIE there can be a potential mismatch between `this` and the CU of ContextDIE when a scope is shared between two DISubprograms belonging to a different CU. In that case, `this` is the CU that was specified in the IR, but the CU of ContextDIE is that of the first subprogram that was emitted. This patch fixes the mismatch by looking up the CU of ContextDIE, and switching to use that. This fixes PR35212 (https://bugs.llvm.org/show_bug.cgi?id=35212) Patch by Philip Craig! Differential revision: https://reviews.llvm.org/D39981 llvm-svn: 318289