[AIX] [XCOFF] Add support for common and local common symbols in the TOC (#79530)

This patch adds support for common and local symbols in the TOC for AIX.
Note that we need to update isVirtualSection so as a common symbol in
TOC will have the symbol type XTY_CM and will be initialized when placed
in the TOC so sections with this type are no longer virtual.

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Co-authored-by: Zaara Syeda <syzaara@ca.ibm.com>