[X86][AVX512FP16] Add the missing const modifiers. NFCI

[pengfei]

Summary

This patch fixes lit fails after D132342.

[RKSimon]

LGTM

[pengfei]

Thanks @RKSimon

clang/include/clang/Basic/BuiltinsX86.def

 TARGET_BUILTIN(__builtin_ia32_mulsh_round_mask, "V8xV8xV8xV8xUcIi", "ncV:128:", "avx512fp16")
 TARGET_BUILTIN(__builtin_ia32_subsh_round_mask, "V8xV8xV8xV8xUcIi", "ncV:128:", "avx512fp16")
 TARGET_BUILTIN(__builtin_ia32_maxsh_round_mask, "V8xV8xV8xV8xUcIi", "ncV:128:", "avx512fp16")
 TARGET_BUILTIN(__builtin_ia32_minsh_round_mask, "V8xV8xV8xV8xUcIi", "ncV:128:", "avx512fp16")
 TARGET_BUILTIN(__builtin_ia32_cmpph512_mask, "UiV32xV32xIiUiIi", "ncV:512:", "avx512fp16")
 TARGET_BUILTIN(__builtin_ia32_cmpph256_mask, "UsV16xV16xIiUs", "ncV:256:", "avx512fp16,avx512vl")
 TARGET_BUILTIN(__builtin_ia32_cmpph128_mask, "UcV8xV8xIiUc", "ncV:128:", "avx512fp16,avx512vl")
 TARGET_BUILTIN(__builtin_ia32_cmpsh_mask, "UcV8xV8xIiUcIi", "ncV:128:", "avx512fp16")
-TARGET_BUILTIN(__builtin_ia32_loadsh128_mask, "V8xV8x*V8xUc", "nV:128:", "avx512fp16")
+TARGET_BUILTIN(__builtin_ia32_loadsh128_mask, "V8xV8xC*V8xUc", "nV:128:", "avx512fp16")
 TARGET_BUILTIN(__builtin_ia32_storesh128_mask, "vV8x*V8xUc", "nV:128:", "avx512fp16")
 
 TARGET_BUILTIN(__builtin_ia32_rcpph128_mask, "V8xV8xV8xUc", "ncV:128:", "avx512fp16,avx512vl")
 TARGET_BUILTIN(__builtin_ia32_rcpph256_mask, "V16xV16xV16xUs", "ncV:256:", "avx512fp16,avx512vl")
 TARGET_BUILTIN(__builtin_ia32_rcpph512_mask, "V32xV32xV32xUi", "ncV:512:", "avx512fp16")
 TARGET_BUILTIN(__builtin_ia32_rsqrtph128_mask, "V8xV8xV8xUc", "ncV:128:", "avx512fp16,avx512vl")
 TARGET_BUILTIN(__builtin_ia32_rsqrtph256_mask, "V16xV16xV16xUs", "ncV:256:", "avx512fp16,avx512vl")
 TARGET_BUILTIN(__builtin_ia32_rsqrtph512_mask, "V32xV32xV32xUi", "ncV:512:", "avx512fp16")

clang/lib/Headers/avx512fp16intrin.h

#define _mm_mask_cmp_sh_mask(M, X, Y, P)                                       \
   ((__mmask8)__builtin_ia32_cmpsh_mask(                                        \
       (__v8hf)(__m128h)(X), (__v8hf)(__m128h)(Y), (int)(P), (__mmask8)(M),     \
       _MM_FROUND_CUR_DIRECTION))
 // loads with vmovsh:
 static __inline__ __m128h __DEFAULT_FN_ATTRS128 _mm_load_sh(void const *__dp) {
   struct __mm_load_sh_struct {
     _Float16 __u;
   } __attribute__((__packed__, __may_alias__));
-  _Float16 __u = ((struct __mm_load_sh_struct *)__dp)->__u;
+  _Float16 __u = ((const struct __mm_load_sh_struct *)__dp)->__u;
   return (__m128h){__u, 0, 0, 0, 0, 0, 0, 0};
 }
 
 static __inline__ __m128h __DEFAULT_FN_ATTRS128
 _mm_mask_load_sh(__m128h __W, __mmask8 __U, const void *__A) {
   __m128h src = (__v8hf)__builtin_shufflevector(
       (__v8hf)__W, (__v8hf)_mm_setzero_ph(), 0, 8, 8, 8, 8, 8, 8, 8);
 
-  return (__m128h)__builtin_ia32_loadsh128_mask((__v8hf *)__A, src, __U & 1);
+  return (__m128h)__builtin_ia32_loadsh128_mask((const __v8hf *)__A, src, __U & 1);
 }
 
 static __inline__ __m128h __DEFAULT_FN_ATTRS128
 _mm_maskz_load_sh(__mmask8 __U, const void *__A) {
   return (__m128h)__builtin_ia32_loadsh128_mask(
-      (__v8hf *)__A, (__v8hf)_mm_setzero_ph(), __U & 1);
+      (const __v8hf *)__A, (__v8hf)_mm_setzero_ph(), __U & 1);
 }
 
 static __inline__ __m512h __DEFAULT_FN_ATTRS512
 _mm512_load_ph(void const *__p) {
   return *(const __m512h *)__p;
 }
 
 static __inline__ __m256h __DEFAULT_FN_ATTRS256