Avoid using the non-portable type __m128i_u.

According to https://stackoverflow.com/a/68939636 it is safe to use
__m128i instead.

https://learn.microsoft.com/en-us/cpp/intrinsics/x86-intrinsics-list?view=msvc-170 also uses this type instead

Fixes #1330

PiperOrigin-RevId: 491427300
Change-Id: I4a1d44ac4d5e7c1e1ee063ff397935df118254a1

absl/crc/internal/crc_memcpy_x86_64.cc

@@ -98,7 +98,7 @@ inline void LargeTailCopy(crc32c_t* crcs, char** dst, const char** src,
       int region = i;
 
       auto* vsrc =
-          reinterpret_cast<const __m128i_u*>(*src + region_size * region);
+          reinterpret_cast<const __m128i*>(*src + region_size * region);
       auto* vdst = reinterpret_cast<__m128i*>(*dst + region_size * region);
 
       // Load the blocks, unaligned
@@ -272,8 +272,8 @@ crc32c_t AcceleratedCrcMemcpyEngine<vec_regions, int_regions>::Compute(
         // slots by using the integer registers.
         int region = (j + i) % kRegions;
 
-        auto* src = reinterpret_cast<const __m128i_u*>(src_bytes +
-                                                       region_size * region);
+        auto* src =
+            reinterpret_cast<const __m128i*>(src_bytes + region_size * region);
         auto* dst =
             reinterpret_cast<__m128i*>(dst_bytes + region_size * region);