[llvm] [libc][bazel] Add BUILD rules for float16 math functions. (PR #114187)

[via llvm-commits]

================
@@ -2797,13 +3068,28 @@ libc_math_function(
     ],
 )
 
+libc_math_function(
+    name = "sinhf16",
+    additional_deps = [
+        ":expxf16",
+    ],
+)
+
 libc_math_function(
     name = "sinpif",
     additional_deps = [
         ":sincosf_utils",
     ],
 )
 
+libc_math_function(
+    name = "sinpif16",
+    additional_deps = [
----------------
lntue wrote:

I think you missed some additional dependency / header here:
```
$ bazel build --config=generic_clang --features=layering_
check @llvm-project//libc/...
INFO: Analyzed 1634 targets (87 packages loaded, 8315 targets configured).
...
external/llvm-project/libc/src/math/generic/sinpif16.cpp:12:10: fatal error: 'sincosf16_utils.h' file not found
#include "sincosf16_utils.h"
         ^~~~~~~~~~~~~~~~~~~
1 error generated.
```

https://github.com/llvm/llvm-project/pull/114187