Re-enable tile_k = 1 x86 kernel for msan

This was erroneously disabled, it doesn't use _mm256_hadd_ps, and it causes us to not have any kernel for consistent arithmetic with msan.

Also, clean up logging in the case we don't have a kernel.

PiperOrigin-RevId: 838818343

Author: dsharletg

ynnpack/kernels/dot/dot.cc

@@ -318,9 +318,14 @@ dot_kernel get_dot_kernel(const dot_shape& shape,
 #include "ynnpack/kernels/dot/kernels.inc"
 #undef YNN_DOT_KERNEL
   if (!packed_shape) {
-    YNN_LOG_INFO() << "Using dot kernel " << optimizer.kernel_used
-                   << " for dot " << shape.m << "x" << shape.n << "x"
-                   << shape.k1;
+    if (optimizer.result.kernel) {
+      YNN_LOG_INFO() << "Using dot kernel " << optimizer.kernel_used
+                     << " for dot " << shape.m << "x" << shape.n << "x"
+                     << shape.k1;
+    } else {
+      YNN_LOG_WARNING() << "No dot kernel found for dot " << shape.m << "x"
+                        << shape.n << "x" << shape.k1;
+    }
   }
   return optimizer.result;
 }

ynnpack/kernels/dot/kernels.inc

@@ -37,9 +37,7 @@ YNN_DOT_KERNEL(arch_flag::amxint8, dot_uint8_int8_int32_16x64x64_16x16x4_amxint8
 #endif  // MEMORY_SANITIZER
 #endif  // YNN_ARCH_X86_AVX2
 #ifdef YNN_ARCH_X86_FMA3
-#ifndef MEMORY_SANITIZER  // TODO(b/458235638)
 #include "ynnpack/kernels/dot/x86_fma3_fp32.inc"
-#endif  // MEMORY_SANITIZER
 #endif  // YNN_ARCH_X86_FMA3
 #ifdef YNN_ARCH_X86_AVX2_FMA3
 #include "ynnpack/kernels/dot/x86_avx2_fma3_bf16_bf16_fp32.inc"