[PATCH] Fix the remainder of PR22762 (GDB is crashing on DW_OP_piece being used inside of DW_AT_frame_base)

[H.J Lu]

Maybe it is specific to x32.  When a register is used as frame register,
the upper 32 bits are guaranteed to zero by hardware.  We don't need
DW_OP_piece to describe the lower 32 bits of a frame register.


http://reviews.llvm.org/D8233

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