[clang][x86] Prevent signed/unsigned comparison warnings on constexpr m128i/m256i/m512i match helpers.

These matches are here to help match hex patterns so consistently match with unsigned uint64_t types

Author: RKSimon

clang/test/CodeGen/X86/builtin_test_helpers.h

@@ -12,7 +12,8 @@ constexpr bool match_m128d(__m128d v, double a, double b) {
   return v[0] == a && v[1] == b;
 }
 
-constexpr bool match_m128i(__m128i v, unsigned long long a, unsigned long long b) {
+constexpr bool match_m128i(__m128i _v, unsigned long long a, unsigned long long b) {
+  __v2du v = (__v2du)_v;
   return v[0] == a && v[1] == b;
 }
 
@@ -43,7 +44,8 @@ constexpr bool match_m256d(__m256d v, double a, double b, double c, double d) {
   return v[0] == a && v[1] == b && v[2] == c && v[3] == d;
 }
 
-constexpr bool match_m256i(__m256i v, unsigned long long a, unsigned long long b, unsigned long long c, unsigned long long d) {
+constexpr bool match_m256i(__m256i _v, unsigned long long a, unsigned long long b, unsigned long long c, unsigned long long d) {
+  __v4du v = (__v4du)_v;
   return v[0] == a && v[1] == b && v[2] == c && v[3] == d;
 }
 
@@ -55,7 +57,8 @@ constexpr bool match_m512d(__m512d v, double a, double b, double c, double d, do
   return v[0] == a && v[1] == b && v[2] == c && v[3] == d && v[4] == e && v[5] == f && v[6] == g && v[7] == h;
 }
 
-constexpr bool match_m512i(__m512i v, unsigned long long a, unsigned long long b, unsigned long long c, unsigned long long d, unsigned long long e, unsigned long long f, unsigned long long g, unsigned long long h) {
+constexpr bool match_m512i(__m512i _v, unsigned long long a, unsigned long long b, unsigned long long c, unsigned long long d, unsigned long long e, unsigned long long f, unsigned long long g, unsigned long long h) {
+  __v8du v = (__v8du)_v;
   return v[0] == a && v[1] == b && v[2] == c && v[3] == d && v[4] == e && v[5] == f && v[6] == g && v[7] == h;
 }