[X86] llc crashed at -O0 and triggered assertion Node is not in map!

[XChy]

Reproducer: https://godbolt.org/z/5eYj9dTEK
Testcase:

define i32 @f() #0 {
entry:
  %0 = load <32 x i64>, ptr null, align 256
  %shuffle = shufflevector <32 x i64> zeroinitializer, <32 x i64> %0, <16 x i32> <i32 27, i32 6, i32 56, i32 54, i32 56, i32 12, i32 24, i32 54, i32 58, i32 57, i32 37, i32 21, i32 9, i32 16, i32 50, i32 29>
  %conv = trunc <16 x i64> %shuffle to <16 x i32>
  %shuffle1 = shufflevector <32 x i64> %0, <32 x i64> zeroinitializer, <16 x i32> <i32 27, i32 6, i32 56, i32 4, i32 6, i32 2, i32 4, i32 4, i32 58, i32 7, i32 7, i32 1, i32 9, i32 6, i32 0, i32 9>
  %conv2 = trunc <16 x i64> %shuffle1 to <16 x i32>
  %shuffle3 = shufflevector <16 x i32> %conv, <16 x i32> %conv2, <32 x i32> <i32 3, i32 9, i32 7, i32 4, i32 17, i32 9, i32 6, i32 9, i32 4, i32 11, i32 9, i32 22, i32 5, i32 7, i32 4, i32 1, i32 5, i32 0, i32 8, i32 2, i32 11, i32 3, i32 31, i32 19, i32 4, i32 8, i32 0, i32 3, i32 28, i32 26, i32 10, i32 4>
  %conv4 = sext <32 x i32> %shuffle3 to <32 x i64>
  store <32 x i64> %conv4, ptr null, align 256
  ret i32 0
}

attributes #0 = { "target-features"="+avx" }

Reproducible commit: 0dd8f32

cc @RKSimon

[llvmbot]

@llvm/issue-subscribers-backend-x86

Author: Hongyu Chen (XChy)

Reproducer: https://godbolt.org/z/5eYj9dTEK Testcase: ```llvm define i32 @f() #0 { entry: %0 = load <32 x i64>, ptr null, align 256 %shuffle = shufflevector <32 x i64> zeroinitializer, <32 x i64> %0, <16 x i32> <i32 27, i32 6, i32 56, i32 54, i32 56, i32 12, i32 24, i32 54, i32 58, i32 57, i32 37, i32 21, i32 9, i32 16, i32 50, i32 29> %conv = trunc <16 x i64> %shuffle to <16 x i32> %shuffle1 = shufflevector <32 x i64> %0, <32 x i64> zeroinitializer, <16 x i32> <i32 27, i32 6, i32 56, i32 4, i32 6, i32 2, i32 4, i32 4, i32 58, i32 7, i32 7, i32 1, i32 9, i32 6, i32 0, i32 9> %conv2 = trunc <16 x i64> %shuffle1 to <16 x i32> %shuffle3 = shufflevector <16 x i32> %conv, <16 x i32> %conv2, <32 x i32> <i32 3, i32 9, i32 7, i32 4, i32 17, i32 9, i32 6, i32 9, i32 4, i32 11, i32 9, i32 22, i32 5, i32 7, i32 4, i32 1, i32 5, i32 0, i32 8, i32 2, i32 11, i32 3, i32 31, i32 19, i32 4, i32 8, i32 0, i32 3, i32 28, i32 26, i32 10, i32 4> %conv4 = sext <32 x i32> %shuffle3 to <32 x i64> store <32 x i64> %conv4, ptr null, align 256 ret i32 0 }

attributes #0 = { "target-features"="+avx" }

Reproducible commit: 0dd8f322c1b40bdac469eec248e3b2b4e1043754

cc @<!-- -->RKSimon 
</details>

[RKSimon]

This doesn't appear to be a new regression