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We previously left the amd64_addr_t attribute uninitialized for OP_REG,
OP_REG_REG and OP_REG_IMM. Make the code more consistent by always
initializing it to the newly introduced X86_ADDR_REG variant, as a bonus
we can also use base_input member to indicate the register input instead
of hardcoding it to 0.

This reverts commit 316b4099.

This didn't turn out to be that useful and just produced warnings in
gcc.

This reverts commit 0401d159.

This didn't turn out to be that useful and just produced warnings in
gcc.

This function was deleted in 2007!

This allows us to properly implement the OS X calling conventions.

In case there also was a Shrs(x, 31),
CSE can be applied after instruction selection.

This fixes opt/loadstore9.c

This fixes opt/loadstore8.c.
Though it does not correct all cases.
More work is needed here.

Otherwise the node directly produces the flags result.
This fixes backend/destam_flags4.c.

This resolves and out of bounds access.