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Mark calls in thunk functions as tail-call optimization candidates

Description

Mark calls in thunk functions as tail-call optimization candidates

When a thunk is generated with a call to the original adjusted function,
the thunk appears in the debugger call stack. We want the backend to perform
tail-call optimization on the call, to make it invisible to the debugger.

This fixes PR24235

Patch by: amjad.aboud@intel.com
Differential Revision: http://reviews.llvm.org/D11476