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[Hexagon] Change declaration order of unique_ptr objects to fix crash (…
…apache#8859) A crash occurs when automatically deleting an instance of CodeGenHexagon because the LLVMContext object has already been freed. Objects of both types are created using unique_ptr, but the object managed by the LLVMContext unique_ptr is passed to CodeGenHexagon object (not as a unique_ptr). This crash is fixed by moving the declaration of the LLVMContext object before the CodeGenHexagon object. I'm not sure if this is the best way to fix this, but it does fix the crash. Also, in other files, the LLVMContext object is always created first. Co-authored-by: Cahoon, Brendon <bcahoon@quicinc.com>
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