adt: Add ALLOCAF().
tv: Inline the value of tarvals into each tarval.

Do not keep a separate set of values and tarvals pointing to these values.
Just have an array with the value in each tarval.
This eliminates a level of indirection and most likely saves memory, too.
tr: Clean up get_entity_ld_ident().
ia32: Remove the never set flag x86_create_am_entities_ip_relative.
ia32: Add and use ia32_is_8bit_val().
ia32: Simplify checks, whether an offset is encodable in a single byte.
simplify primitive type default alignment calculation
sparc: mark spills/reloads as such
sparc: remove unnecessary check for be_is_Reload
amd64: mark spills/reloads as such
arm: provide custom spill/reload constructors
TEMPLATE: provide custom spill/reload functions
remove generic be_Spill/be_Reload node