[SLP][REVEC] Pre-commit test.

Author: HanKuanChen

llvm/test/Transforms/SLPVectorizer/X86/revec-reduced-value-replace-extractelement.ll

@@ -0,0 +1,21 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt -S --passes=slp-vectorizer -slp-threshold=-99999 < %s -mtriple=x86_64-unknown-linux-gnu -slp-revec | FileCheck %s
+
+define void @test() {
+bb:
+  br label %bb1
+
+bb1:
+  %phi = phi i32 [ 0, %bb ], [ %mul9, %bb1 ]
+  %phi2 = phi i32 [ 0, %bb ], [ 0, %bb1 ]
+  %trunc = trunc i64 0 to i32
+  %mul = mul i32 0, %trunc
+  %mul3 = mul i32 %trunc, %phi
+  %mul4 = mul i32 %mul3, %mul
+  %mul5 = mul i32 %mul4, %mul
+  %trunc6 = trunc i64 0 to i32
+  %mul7 = mul i32 0, %trunc6
+  %mul8 = mul i32 %mul5, %mul7
+  %mul9 = mul i32 %mul8, %mul7
+  br label %bb1
+}