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Calls+Jumps really use PC relative addresses even if they look the same
in the assembler. Create an immediate kind for that, this allows a
slightly simpler bemit_entity().

Now we can distinguish from reg to mem (AMD64_OP_ADDR_REG) and from mem to reg (AMD64_OP_REG_ADDR) operations.

This uses the newly introduced be_Relocation node to perform most PIC
transformations in ia32_pic.c. This introduces the elf and elf-no-plt
PIC modes. The "efl" mode does not work yet because the additional ebx
input makes calls register pressure unfaithful.

This is not really a new entity type but merely a relocation type.
Handle it with a x86_immediate_kind.

Handle this similar to the ia32 backend.

be: Factorise the code to emit an asm node and use a callback for each backend to output the operands.

This first version should perform similar to the support in the ia32
backend, but needs more work to add amd64 specific immediate types.

Also adds a new INSN_MODE_INVALID for 0 to catch uninitialized values.

All other structs holding a register class call it cls, too.

All backends emit nothing for Phis and be_Keeps, so set this centrally.