[PowerPC] convert memmove to milicode call .___memmove64[PR] in 64-bit mode (#167334)

conversion of bl memmove call to milicode bl .___memmove64[PR] in
64--bit mode is broken , the patch fix the problem.
 
in the llvm/include/llvm/IR/RuntimeLibcalls.td, we do not need to define
the

 `def ___memmove64 : RuntimeLibcallImpl<MEMCPY>` in PPC64AIXCallList 
` def ___memmove32 : RuntimeLibcallImpl<MEMCPY>` in PPC32AIXCallList
 
 since there is function 
 
```
   /// Return a function impl compatible with RTLIB::MEMCPY, or
  /// RTLIB::Unsupported if fully unsupported.
  RTLIB::LibcallImpl getMemcpyImpl() const {
    RTLIB::LibcallImpl Memcpy = getLibcallImpl(RTLIB::MEMCPY);
    if (Memcpy == RTLIB::Unsupported) {
      // Fallback to memmove if memcpy isn't available.
      return getLibcallImpl(RTLIB::MEMMOVE);
    }

    return Memcpy;
  }
```

0 files changed, 0 insertions, 0 deletions