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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.

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.

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).

We only use the immediate and scale yet on ia32.

This is a bigger rewrite of stack frame handling in the backend:

- Do the stack frame type layout late, after all the spill slots have
  been created. This way we can avoid (and remove) the brittle
  frame_alloc_area().
- Standardize the meaning of stack entity offsets. After stack frame type
  layout they are relative to the stack pointer position at the beginning
  of the function.  It is all in one type now, no splitting into "arg",
  "between" and "stack_frame" type anymore.
- Generalize the stack pointer simulation code to work with a single
  callback. Represent stack state as current offset and align_padding
  number. Now that callbacks can access and modify them both we do not
  need custom code in the sparc backend anymore.
- Remove alignment specification on IncSP, only keep a ignore_align flag
  used for the last IncSP that has to remove all existing sp adjustments
  and may end up on a misaligned SP on ia32/amd64.
- Align stack by default on ia32+amd64 backends.

This way all the backends do not have to filter it by themselves.