[clang] [compiler-rt] [llvm] [TySan] User-friendly (C style) pointer type names for error reports (PR #166381)

[Benjamin Stott via llvm-commits]

BStott6 wrote:

In order to be able to concatenate the pointer asterisks onto the type name without allocating, I have changed `getDisplayName` to `writeDemangledTypeName` which writes the name into a provided buffer. Originally I had changed it to write the name straight to stdout, but this would be incompatible with @gbMattN's PR https://github.com/llvm/llvm-project/pull/169023.

https://github.com/llvm/llvm-project/pull/166381