[llvm] [XCOFF][OBJECT] get symbol size by calling XCOFF interfaces (PR #67304)

[James Henderson via llvm-commits]

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+; RUN: llc -filetype=obj -o %t -mtriple=powerpc-aix-ibm-xcoff < %s
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jh7370 wrote:

Noting that I'll be making comments on this test in the other PR (I miss stacked reviews).

https://github.com/llvm/llvm-project/pull/67304