[ubsan] Minimize size of data for type_mismatch (Redo of D19667)

Summary:
This patch makes the type_mismatch static data 7 bytes smaller (and it
ends up being 16 bytes smaller due to alignment restrictions, at least
on some x86-64 environments).

It revs up the type_mismatch handler version since we're breaking binary
compatibility. I will soon post a patch for the compiler-rt side.

Reviewers: rsmith, kcc, vitalybuka, pgousseau, gbedwell

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D28242

llvm-svn: 291236