[DAGCombiner] Add general constant vector support to (shl (add x, c1), c2) -> (add (shl x, c2), c1 << c2)

We already supported scalar constant / splatted constant vector - now accepts any (non opaque) constant scalar / vector

llvm-svn: 284613
diff --git a/llvm/test/CodeGen/X86/combine-shl.ll b/llvm/test/CodeGen/X86/combine-shl.ll
index e978803..3f3871e 100644
--- a/llvm/test/CodeGen/X86/combine-shl.ll
+++ b/llvm/test/CodeGen/X86/combine-shl.ll
@@ -526,8 +526,8 @@
 ;
 ; AVX-LABEL: combine_vec_shl_add1:
 ; AVX:       # BB#0:
-; AVX-NEXT:    vpaddd {{.*}}(%rip), %xmm0, %xmm0
 ; AVX-NEXT:    vpsllvd {{.*}}(%rip), %xmm0, %xmm0
+; AVX-NEXT:    vpaddd {{.*}}(%rip), %xmm0, %xmm0
 ; AVX-NEXT:    retq
   %1 = add <4 x i32> %x, <i32 5, i32 6, i32 7, i32 8>
   %2 = shl <4 x i32> %1, <i32 1, i32 2, i32 3, i32 4>