[RISCV] Add test case showing that removal of W suffixes doesn't work…

… with DBG_VALUE uses. NFC

llvm/test/CodeGen/RISCV/sextw-removal-debug.mir

@@ -0,0 +1,62 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 4
+# RUN: llc %s -mtriple=riscv64 -run-pass=riscv-opt-w-instrs -o - | FileCheck %s
+
+--- |
+  define void @foo(i32 signext %a, i32 signext %b, ptr %c) !dbg !5 {
+  entry:
+    %add = add nsw i32 %b, %a, !dbg !11
+    tail call void @llvm.dbg.value(metadata i32 %add, metadata !9, metadata !DIExpression()), !dbg !11
+    store i32 %add, ptr %c, align 4, !dbg !12
+    ret void, !dbg !13
+  }
+
+  declare void @llvm.dbg.value(metadata, metadata, metadata) #0
+
+  attributes #0 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
+
+  !llvm.dbg.cu = !{!0}
+  !llvm.debugify = !{!2, !3}
+  !llvm.module.flags = !{!4}
+
+  !0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
+  !1 = !DIFile(filename: "test.ll", directory: "/")
+  !2 = !{i32 3}
+  !3 = !{i32 1}
+  !4 = !{i32 2, !"Debug Info Version", i32 3}
+  !5 = distinct !DISubprogram(name: "foo", linkageName: "foo", scope: null, file: !1, line: 1, type: !6, scopeLine: 1, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !8)
+  !6 = !DISubroutineType(types: !7)
+  !7 = !{}
+  !8 = !{!9}
+  !9 = !DILocalVariable(name: "1", scope: !5, file: !1, line: 1, type: !10)
+  !10 = !DIBasicType(name: "ty32", size: 32, encoding: DW_ATE_unsigned)
+  !11 = !DILocation(line: 1, column: 1, scope: !5)
+  !12 = !DILocation(line: 2, column: 1, scope: !5)
+  !13 = !DILocation(line: 3, column: 1, scope: !5)
+
+...
+---
+name:            foo
+tracksRegLiveness: true
+body:             |
+  bb.0.entry:
+    liveins: $x10, $x11, $x12
+
+    ; CHECK-LABEL: name: foo
+    ; CHECK: liveins: $x10, $x11, $x12
+    ; CHECK-NEXT: {{  $}}
+    ; CHECK-NEXT: [[COPY:%[0-9]+]]:gpr = COPY $x12
+    ; CHECK-NEXT: [[COPY1:%[0-9]+]]:gpr = COPY $x11
+    ; CHECK-NEXT: [[COPY2:%[0-9]+]]:gpr = COPY $x10
+    ; CHECK-NEXT: [[ADDW:%[0-9]+]]:gpr = ADDW [[COPY1]], [[COPY2]], debug-location !11
+    ; CHECK-NEXT: DBG_VALUE [[ADDW]], $noreg, !9, !DIExpression(), debug-location !11
+    ; CHECK-NEXT: SW killed [[ADDW]], [[COPY]], 0, debug-location !12 :: (store (s32) into %ir.c)
+    ; CHECK-NEXT: PseudoRET debug-location !13
+    %2:gpr = COPY $x12
+    %1:gpr = COPY $x11
+    %0:gpr = COPY $x10
+    %3:gpr = ADDW %1, %0, debug-location !11
+    DBG_VALUE %3, $noreg, !9, !DIExpression(), debug-location !11
+    SW killed %3, %2, 0, debug-location !12 :: (store (s32) into %ir.c)
+    PseudoRET debug-location !13
+
+...