[libc][bazel] Add BUILD rules for float16 math functions.

Author: vonosmas

utils/bazel/llvm-project-overlay/libc/BUILD.bazel

@@ -1702,6 +1702,17 @@ libc_support_library(
     ],
 )
 
+libc_support_library(
+    name = "sincosf16_utils",
+    hdrs = ["src/math/generic/sincosf16_utils.h"],
+    deps = [
+        ":__support_common",
+        ":__support_fputil_fp_bits",
+        ":__support_fputil_nearest_integer",
+        ":__support_fputil_polyeval",
+    ],
+)
+
 libc_support_library(
     name = "explogxf",
     srcs = ["src/math/generic/explogxf.cpp"],
@@ -1990,6 +2001,15 @@ libc_math_function(
     ],
 )
 
+libc_math_function(
+    name = "cospif16",
+    additional_deps = [
+        ":__support_fputil_multiply_add",
+        ":__support_macros_optimization",
+        ":sincosf16_utils",
+    ],
+)
+
 libc_math_function(name = "daddl")
 
 libc_math_function(name = "daddf128")
@@ -3087,6 +3107,7 @@ libc_math_function(
     additional_deps = [
         ":__support_fputil_nearest_integer",
         ":__support_fputil_polyeval",
+        ":sincosf16_utils",
     ],
 )