XCOFF no inline ptr glue (#193786) Adds an option for out of line indirect calls. `-maix-use-ptrgl` enables the option, and when enabled indirect calls will load the address of the function descriptor of the callee into r11, keeping all other arguments the same and do a direct branch to `._ptrgl` which contains the indirect call sequence code. The call is followed by a toc restore since ptrglue does a tail call and cannot restore the toc itself. The negative option `-mno-aix-use-ptrgl` is also added to revert back to the default behaviour of emitting the indirect call sequence inline at the call site. --------- Co-authored-by: Hubert Tong <hubert.reinterpretcast@gmail.com>
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