[libc][math] Fix use of float16 not guarded by LIBC_TYPES_HAS_FLOAT16 (#100241)

Summary: 

Test Plan: 

Reviewers: 

Subscribers: 

Tasks: 

Tags: 


Differential Revision: https://phabricator.intern.facebook.com/D60251163

Author: overmighty

libc/src/__support/FPUtil/BasicOperations.h

@@ -44,6 +44,7 @@ LIBC_INLINE cpp::enable_if_t<cpp::is_floating_point_v<T>, T> max(T x, T y) {
   return x > y ? x : y;
 }
 
+#ifdef LIBC_TYPES_HAS_FLOAT16
 #if defined(__LIBC_USE_BUILTIN_FMAXF16_FMINF16)
 template <> LIBC_INLINE float16 max(float16 x, float16 y) {
   return __builtin_fmaxf16(x, y);
@@ -58,6 +59,7 @@ template <> LIBC_INLINE float16 max(float16 x, float16 y) {
   return ((xi > yi) != (xi < 0 && yi < 0)) ? x : y;
 }
 #endif
+#endif // LIBC_TYPES_HAS_FLOAT16
 
 #if defined(__LIBC_USE_BUILTIN_FMAX_FMIN) && !defined(LIBC_TARGET_ARCH_IS_X86)
 template <> LIBC_INLINE float max(float x, float y) {
@@ -82,6 +84,7 @@ LIBC_INLINE cpp::enable_if_t<cpp::is_floating_point_v<T>, T> min(T x, T y) {
   return x < y ? x : y;
 }
 
+#ifdef LIBC_TYPES_HAS_FLOAT16
 #if defined(__LIBC_USE_BUILTIN_FMAXF16_FMINF16)
 template <> LIBC_INLINE float16 min(float16 x, float16 y) {
   return __builtin_fminf16(x, y);
@@ -96,6 +99,7 @@ template <> LIBC_INLINE float16 min(float16 x, float16 y) {
   return ((xi < yi) != (xi < 0 && yi < 0)) ? x : y;
 }
 #endif
+#endif // LIBC_TYPES_HAS_FLOAT16
 
 #if defined(__LIBC_USE_BUILTIN_FMAX_FMIN) && !defined(LIBC_TARGET_ARCH_IS_X86)
 template <> LIBC_INLINE float min(float x, float y) {