[Support] Disable SaturatingMultiply() unit test while investigating

Ubsan detected undefined behavior in the MathExtras SaturatingMultiply test.

This change disables the test while it is being investigated.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@253539 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed