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Add a comment explaining the need of a global temporary variable

Description

Add a comment explaining the need of a global temporary variable

cpu_xirr is used only as a temporary location for the OPAL call in
PIC_DISPATCH().

Requested by: nwhitehorn

Details

Provenance
jhibbitsAuthored on
Parents
rS334013: Welcome Leandro Lupori (luporl@) to the ranks of src committers
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