[llvm] RuntimeLibcalls: Add sqrtf to the Hexagon runtime libcall set (PR #210909)

[Santanu Das via llvm-commits]

https://github.com/quic-santdas commented:

The patch looks good. Please add a small testcase to demonstrate the fact that hexagon_sqrtf is called instead of sqrtf.

https://github.com/llvm/llvm-project/pull/210909