[CIR][CodeGen][Builtin] `sync_lock_test_and_set`

[tommymcm]

Minimized test case:

A;
B() { __sync_lock_test_and_set(&A, A); }

Failed assertion:

clangir/clang/lib/CIR/CodeGen/CIRGenBuiltin.cpp

Line 2003 in aeac352

llvm_unreachable("BI__sync_lock_test_and_set_1 like NYI");

[vishruth-thimmaiah]

Hi, I'd like to work on this issue if it's available.