Add tests

Author: jsji

llvm/test/CodeGen/MIR/X86/pr126107.mir

@@ -0,0 +1,17 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 5
+# RUN: llc -o - %s -mtriple=x86_64-- -run-pass=machine-cp | FileCheck %s
+
+---
+name:            main
+body:             |
+ bb.0.entry:
+    liveins: $ymm7
+    ; CHECK-LABEL: name: main
+    ; CHECK: liveins: $ymm7
+    ; CHECK-NEXT: {{  $}}
+    ; CHECK-NEXT: renamable $ymm6 = COPY killed renamable $ymm7
+    ; CHECK-NEXT: CALL64r killed renamable $rax, csr_64_mostregs
+    ; CHECK-NEXT: renamable $ymm6 = VPADDWZ256rr $ymm6, $ymm6
+       renamable $ymm6 = COPY killed renamable $ymm7
+       CALL64r killed renamable $rax, csr_64_mostregs
+       renamable $ymm6 = VPADDWZ256rr $ymm6, $ymm6