XCore target: add section information.

[Robert Lytton]

Hi,

Here is a patch for the XCore CodeGen handling of constants.

    XCore target: add section information.
    Xcore target ABI requires const data that is externally visible
    to be handled differently if it has C-language linkage rather than
    C++ language linkage.

Follow up to: [cfe-dev] static const structures declared as "external global %struct.S" instead of "external constant %struct.S"

Thank you

Robert
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