XCore target: fix const section handling

[Robert Lytton]

Hi,

Here is a patch for the xcore target

    XCore target: fix const section handling

    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.

    Clang now emits ".cp.rodata" section information.

    All other externally visible constant data will be placed in the DP section.

Robert
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