libclc: add half version of 'sign' (#99841)

GitOrigin-RevId: 46223b5eae1ae25ad0d8ca47ea210c1781cb03fc

generic/lib/common/sign.cl

diff --git a/generic/lib/common/sign.cl b/generic/lib/common/sign.cl
index 25832e0..7b6b793 100644
--- a/generic/lib/common/sign.cl
+++ b/generic/lib/common/sign.cl
@@ -26,3 +26,12 @@
 _CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, double, sign, double)
 
 #endif
+
+#ifdef cl_khr_fp16
+
+#pragma OPENCL EXTENSION cl_khr_fp16 : enable
+
+SIGN(half,)
+_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, half, sign, half)
+
+#endif