[DataLayout] Specialize the getTypeAllocSize() implementation (#156687)

getTypeAllocSize() currently works by taking the type store size and
aligning it to the ABI alignment. However, this ends up doing redundant
work in various cases, for example arrays will unnecessarily repeat the
alignment step, and structs will fetch the StructLayout multiple times.

As this code is rather hot (it is called every time we need to calculate
GEP offsets for example), specialize the implementation. This repeats a
small amount of logic from getAlignment(), but I think that's
worthwhile.

0 files changed, 0 insertions, 0 deletions