adds mappings for f16 variants of halide float math (#8029)

* adds mappings for f16 variants of halide float math

* fix clang format errors

* trigger buildbots

---------

Co-authored-by: Steven Johnson <srj@google.com>

src/CodeGen_Metal_Dev.cpp

@@ -795,6 +795,31 @@ void CodeGen_Metal_Dev::init_module() {
                << "#define tanh_f32 tanh\n"
                << "#define atanh_f32 atanh\n"
                << "#define fast_inverse_sqrt_f32 rsqrt\n"
+               << "#define is_nan_f16 isnan\n"
+               << "#define is_inf_f16 isinf\n"
+               << "#define is_finite_f16 isfinite\n"
+               << "#define sqrt_f16 sqrt\n"
+               << "#define sin_f16 sin\n"
+               << "#define cos_f16 cos\n"
+               << "#define exp_f16 exp\n"
+               << "#define log_f16 log\n"
+               << "#define abs_f16 fabs\n"
+               << "#define floor_f16 floor\n"
+               << "#define ceil_f16 ceil\n"
+               << "#define trunc_f16 trunc\n"
+               << "#define pow_f16 pow\n"
+               << "#define asin_f16 asin\n"
+               << "#define acos_f16 acos\n"
+               << "#define tan_f16 tan\n"
+               << "#define atan_f16 atan\n"
+               << "#define atan2_f16 atan2\n"
+               << "#define sinh_f16 sinh\n"
+               << "#define asinh_f16 asinh\n"
+               << "#define cosh_f16 cosh\n"
+               << "#define acosh_f16 acosh\n"
+               << "#define tanh_f16 tanh\n"
+               << "#define atanh_f16 atanh\n"
+               << "#define fast_inverse_sqrt_f16 rsqrt\n"
                // This is quite annoying: even though the MSL docs claim
                // all versions of Metal support the same memory fence
                // names, the truth is that 1.0 does not.