XCore target: fix bug in XCoreLowerThreadLocal.cpp

[Robert Lytton]

Hi,

Attached is a patch to fix:

   XCore target: fix bug in XCoreLowerThreadLocal.cpp

    When a ConstantExpr which uses a thread local is part of a PHI node
    instruction, the insruction that replaces the ConstantExpr must
    be inserted in the calling block just before the branch instruction.


Robert
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