Don't static_cast invalid pointers

UBSan complained about using static_cast on the invalid (tombstone, etc.)
pointers used by DenseMap. Use a reinterpret_cast instead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217397 91177308-0d34-0410-b5e6-96231b3b80d8
llvm-cov: Remove dead code

FunctionCoverageMapping::PrettyName was from a version of the tool
during review, and isn't actually used currently.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217398 91177308-0d34-0410-b5e6-96231b3b80d8
Group unsafe fmul math folds together for easier reading. No functional change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217399 91177308-0d34-0410-b5e6-96231b3b80d8