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The node is usually less interesting for backend nodes, so it is enough
to have it in the detail attributes.

This is shorter than loading from a constant pool.
gcc does it, too.

base, index an mem are never null after calling build_address().

No caller uses this flag.

'match_upconv' might sign-extend, which is wrong for doing a popcount.

The operand is a pointer, so always has the right width.

This avoids some (mostly false) warnings about missing initializers.

Nearly all structs derived from amd64_attr_t has a size member anyway.
Simplify the code and move it to the base amd64_attr_t.

Either the conv is used as the new result or it has further users.
In either case it is used afterwards and cannot be removed.

The mode of both nodes is the mode for the GP register class already.

'match_immediate_32()' in the meantime got a parameter 'must_match_ip_relative'.

The documented variable was removed in 2011.

This meant initializing the address mode variant all over the ia32
backend, on the other hand this will be useful if we ever switch the
ia32 backend to a style without NoReg nodes (like amd64).