Use the real LL type representing the TypeInfo (sub)class directly and
from the beginning, i.e., already for the declaration, instead of
building an extra LL struct type (firstly opaque, then finalized when
defining the TypeInfo via RTTIBuilder).
To get this to work in all cases, the dummy TypeInfo for opaque structs
is now a complete TypeInfo_Struct, with all 11/13 fields zero-
initialized. Previously, it was a special TypeInfo (no extra
TypeInfo_Struct fields) with TypeInfo_Struct vtable, something which DMD
also emits.
Also refactor the RTTIBuilder finalize() interface - e.g., don't set the
linkage there (had to be reverted for ModuleInfos) and only take the
global variable to be defined. Cast the field initializers if required,
e.g., null pointers to appropriately typed function pointers for
TypeInfo_Struct etc.
We already generated the memsets for zeroing the padding,
but because we relied on the native LLVM type allignment
where possible instead of generating explicit padding
values, LLVM did not always copy those bytes around (e.g.
when spilling/reloading registers).
1. Main include corresponding to .cpp file, if any.
2. DMD and LDC includes.
3. LLVM includes.
4. System includes.
Also updated a few include guards to match the default format.
Fixed problem with DtoConstSize_t taking a size_t argument, this is not enough for cross compiling from 32bit host to a 64bit target. It now takes uint64_t. There's probably a lot of similar case around to code ...
