[DebugInfo][LICM] Drop DebugLoc from IntrinsicInst when hoisting

The DebugLoc is conserved when hoisting function calls, to ensure the
DIScope is preserved if inlining occurs.

This commit drops the DebugLoc in the case the call is an intrinsic
call that won't be lowered into a function call.

Differential Revision: https://reviews.llvm.org/D134429