update_test_checks: pre-commit a new test

The test shows that name preservation doesn't work properly when
--include-generated-funcs is used.

Author: nhaehnle

llvm/test/tools/UpdateTestChecks/update_test_checks/Inputs/stable_ir_values_funcs.ll

@@ -0,0 +1,23 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --include-generated-funcs --version 3
+; RUN: opt < %s -S | FileCheck %s
+
+; The assumption underlying this test is that there are pre-existing check lines
+; but something has changed, and we would like to avoid needless changes of
+; meta variable names so that diffs end up being easier to read, e.g. avoid
+; changing X_I33 into X_I34 or renumbering the various TMP variables.
+
+define i32 @func({i32, i32} %x, i32 %y) {
+  %x.i34 = extractvalue {i32, i32} %x, 0
+  %1 = add i32 %y, 1
+  %2 = add i32 %x.i34, %1
+  %3 = mul i32 %2, 3
+  ret i32 %3
+}
+
+; CHECK-LABEL: define i32 @func(
+; CHECK-SAME: { i32, i32 } [[X:%.*]], i32 [[Y:%.*]]) {
+; CHECK-NEXT:    [[X_I33:%.*]] = extractvalue { i32, i32 } [[X]], 0
+; CHECK-NEXT:    [[TMP1:%.*]] = add i32 [[X_I33]], [[Y]]
+; CHECK-NEXT:    [[TMP2:%.*]] = mul i32 [[TMP1]], 3
+; CHECK-NEXT:    ret i32 [[TMP2]]
+;

llvm/test/tools/UpdateTestChecks/update_test_checks/Inputs/stable_ir_values_funcs.ll.expected

@@ -0,0 +1,24 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --include-generated-funcs --version 3
+; RUN: opt < %s -S | FileCheck %s
+
+; The assumption underlying this test is that there are pre-existing check lines
+; but something has changed, and we would like to avoid needless changes of
+; meta variable names so that diffs end up being easier to read, e.g. avoid
+; changing X_I33 into X_I34 or renumbering the various TMP variables.
+
+define i32 @func({i32, i32} %x, i32 %y) {
+  %x.i34 = extractvalue {i32, i32} %x, 0
+  %1 = add i32 %y, 1
+  %2 = add i32 %x.i34, %1
+  %3 = mul i32 %2, 3
+  ret i32 %3
+}
+
+; CHECK-LABEL: define i32 @func(
+; CHECK-SAME: { i32, i32 } [[X:%.*]], i32 [[Y:%.*]]) {
+; CHECK-NEXT:    [[X_I34:%.*]] = extractvalue { i32, i32 } [[X]], 0
+; CHECK-NEXT:    [[TMP1:%.*]] = add i32 [[Y]], 1
+; CHECK-NEXT:    [[TMP2:%.*]] = add i32 [[X_I34]], [[TMP1]]
+; CHECK-NEXT:    [[TMP3:%.*]] = mul i32 [[TMP2]], 3
+; CHECK-NEXT:    ret i32 [[TMP3]]
+;

llvm/test/tools/UpdateTestChecks/update_test_checks/stable_ir_values_funcs.test

@@ -0,0 +1,2 @@
+# RUN: cp -f %S/Inputs/stable_ir_values_funcs.ll %t.ll && %update_test_checks %t.ll
+# RUN: diff -u %t.ll %S/Inputs/stable_ir_values_funcs.ll.expected