[ubsan] Minimize size of data for type_mismatch (Redo of D19668)

Summary: This is the compiler-rt side of D28242.

Reviewers: kcc, vitalybuka, pgousseau, gbedwell

Subscribers: kubabrecka, llvm-commits

Differential Revision: https://reviews.llvm.org/D28244

llvm-svn: 291237