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[XCOFF][NFC] make StorageMappingClass/SymbolType member optional

Authored by shchenz on Feb 18 2021, 1:41 AM.

Description

[XCOFF][NFC] make StorageMappingClass/SymbolType member optional

This patch makes StorageMappingClass/SymbolType member optional in
class MCSectionXCOFF.

Non-csect sections like debug sections have no such properties.

Reviewed By: hubert.reinterpretcast

Differential Revision: https://reviews.llvm.org/D96641