JIT: Improve block unrolling, enable AVX-512 (#85501)

Author: EgorBo

src/coreclr/jit/codegen.h

@@ -780,6 +780,9 @@ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
 #endif
 
     void genSetRegToConst(regNumber targetReg, var_types targetType, GenTree* tree);
+#if defined(FEATURE_SIMD)
+    void genSetRegToConst(regNumber targetReg, var_types targetType, simd_t* val);
+#endif
     void genCodeForTreeNode(GenTree* treeNode);
     void genCodeForBinary(GenTreeOp* treeNode);