diff --git a/bolt/test/X86/Inputs/dwarf4-df-dualcu-helper.s b/bolt/test/X86/Inputs/dwarf4-df-dualcu-helper.s
--- a/bolt/test/X86/Inputs/dwarf4-df-dualcu-helper.s
+++ b/bolt/test/X86/Inputs/dwarf4-df-dualcu-helper.s
@@ -1,3 +1,14 @@
+# clang++ -g -gdwarf-4 -emit-llvm -S helper.cpp
+# llc -O0 -mtriple=x86_64-unknown-linux-gnu helper.ll
+# int z = 0;
+# int d = 0;
+#
+# int helper(int z_, int d_) {
+#  z += z_;
+#  d += d_;
+#  return z * d;
+# }
+
 	.text
 	.file	"helper.cpp"
 	.file	1 "." "helper.cpp"
diff --git a/bolt/test/X86/Inputs/dwarf4-df-dualcu-loclist-helper.s b/bolt/test/X86/Inputs/dwarf4-df-dualcu-loclist-helper.s
--- a/bolt/test/X86/Inputs/dwarf4-df-dualcu-loclist-helper.s
+++ b/bolt/test/X86/Inputs/dwarf4-df-dualcu-loclist-helper.s
@@ -1,3 +1,14 @@
+# clang++ -g -gdwarf-4 -emit-llvm -S helper.cpp
+# llc -O2 -mtriple=x86_64-unknown-linux-gnu helper.ll
+# int z = 0;
+# int d = 0;
+#
+# int helper(int z_, int d_) {
+#  z += z_;
+#  d += d_;
+#  return z * d;
+# }
+
 	.text
 	.file	"helper.cpp"
 	.file	1 "." "helper.cpp"
diff --git a/bolt/test/X86/Inputs/dwarf4-df-dualcu-loclist-main.s b/bolt/test/X86/Inputs/dwarf4-df-dualcu-loclist-main.s
--- a/bolt/test/X86/Inputs/dwarf4-df-dualcu-loclist-main.s
+++ b/bolt/test/X86/Inputs/dwarf4-df-dualcu-loclist-main.s
@@ -1,3 +1,20 @@
+# clang++ -g -gdwarf-4 -emit-llvm -S main.cpp
+# llc -O2 -mtriple=x86_64-unknown-linux-gnu main.ll
+# void use(int * x, int * y) {
+# *x += 4;
+# *y -= 2;
+# }
+#
+# int helper(int z_, int d_);
+# int x = 0;
+# int y = 1;
+# int  main(int argc, char *argv[]) {
+#    x = argc;
+#    y = argc + 3;
+#    use(&x, &y);
+#    return helper(x, y);
+# }
+
 	.text
 	.file	"main.cpp"
 	.file	1 "." "main.cpp"
diff --git a/bolt/test/X86/Inputs/dwarf4-df-dualcu-main.s b/bolt/test/X86/Inputs/dwarf4-df-dualcu-main.s
--- a/bolt/test/X86/Inputs/dwarf4-df-dualcu-main.s
+++ b/bolt/test/X86/Inputs/dwarf4-df-dualcu-main.s
@@ -1,3 +1,20 @@
+# clang++ -g -gdwarf-4 -emit-llvm -S main.cpp
+# llc -O0 -mtriple=x86_64-unknown-linux-gnu main.ll
+# void use(int * x, int * y) {
+# *x += 4;
+# *y -= 2;
+# }
+#
+# int helper(int z_, int d_);
+# int x = 0;
+# int y = 1;
+# int  main(int argc, char *argv[]) {
+#    x = argc;
+#    y = argc + 3;
+#    use(&x, &y);
+#    return helper(x, y);
+# }
+
 	.text
 	.file	"main.cpp"
 	.file	1 "." "main.cpp"
diff --git a/bolt/test/X86/Inputs/dwarf5-df-dualcu-helper.s b/bolt/test/X86/Inputs/dwarf5-df-dualcu-helper.s
--- a/bolt/test/X86/Inputs/dwarf5-df-dualcu-helper.s
+++ b/bolt/test/X86/Inputs/dwarf5-df-dualcu-helper.s
@@ -1,3 +1,14 @@
+# clang++ -g -gdwarf-5 -emit-llvm -S helper.cpp
+# llc -O0 -mtriple=x86_64-unknown-linux-gnu helper.ll
+# int z = 0;
+# int d = 0;
+#
+# int helper(int z_, int d_) {
+#  z += z_;
+#  d += d_;
+#  return z * d;
+# }
+
 	.text
 	.file	"helper.cpp"
 	.file	0 "." "helper.cpp" md5 0xe635924a35b65444173d0c76a54b866f
diff --git a/bolt/test/X86/Inputs/dwarf5-df-dualcu-loclist-helper.s b/bolt/test/X86/Inputs/dwarf5-df-dualcu-loclist-helper.s
--- a/bolt/test/X86/Inputs/dwarf5-df-dualcu-loclist-helper.s
+++ b/bolt/test/X86/Inputs/dwarf5-df-dualcu-loclist-helper.s
@@ -1,3 +1,14 @@
+# clang++ -g -gdwarf-5 -emit-llvm -S helper.cpp
+# llc -O2 -mtriple=x86_64-unknown-linux-gnu helper.ll
+# int z = 0;
+# int d = 0;
+#
+# int helper(int z_, int d_) {
+#  z += z_;
+#  d += d_;
+#  return z * d;
+# }
+
 	.text
 	.file	"helper.cpp"
 	.file	0 "." "helper.cpp" md5 0xe635924a35b65444173d0c76a54b866f
diff --git a/bolt/test/X86/Inputs/dwarf5-df-dualcu-loclist-main.s b/bolt/test/X86/Inputs/dwarf5-df-dualcu-loclist-main.s
--- a/bolt/test/X86/Inputs/dwarf5-df-dualcu-loclist-main.s
+++ b/bolt/test/X86/Inputs/dwarf5-df-dualcu-loclist-main.s
@@ -1,3 +1,20 @@
+# clang++ -g -gdwarf-5 -emit-llvm -S main.cpp
+# llc -O2 -mtriple=x86_64-unknown-linux-gnu main.ll
+# void use(int * x, int * y) {
+# *x += 4;
+# *y -= 2;
+# }
+#
+# int helper(int z_, int d_);
+# int x = 0;
+# int y = 1;
+# int  main(int argc, char *argv[]) {
+#    x = argc;
+#    y = argc + 3;
+#    use(&x, &y);
+#    return helper(x, y);
+# }
+
 	.text
 	.file	"main.cpp"
 	.file	0 "." "main.cpp" md5 0x1f627913a0daee879e00a3a51726f0ef
diff --git a/bolt/test/X86/Inputs/dwarf5-df-dualcu-main.s b/bolt/test/X86/Inputs/dwarf5-df-dualcu-main.s
--- a/bolt/test/X86/Inputs/dwarf5-df-dualcu-main.s
+++ b/bolt/test/X86/Inputs/dwarf5-df-dualcu-main.s
@@ -1,3 +1,20 @@
+# clang++ -g -gdwarf-5 -emit-llvm -S main.cpp
+# llc -O0 -mtriple=x86_64-unknown-linux-gnu main.ll
+# void use(int * x, int * y) {
+# *x += 4;
+# *y -= 2;
+# }
+#
+# int helper(int z_, int d_);
+# int x = 0;
+# int y = 1;
+# int  main(int argc, char *argv[]) {
+#    x = argc;
+#    y = argc + 3;
+#    use(&x, &y);
+#    return helper(x, y);
+# }
+
 	.text
 	.file	"main.cpp"
 	.file	0 "." "main.cpp" md5 0x1f627913a0daee879e00a3a51726f0ef
diff --git a/bolt/test/X86/Inputs/dwarf5-df-mono-helper.s b/bolt/test/X86/Inputs/dwarf5-df-mono-helper.s
--- a/bolt/test/X86/Inputs/dwarf5-df-mono-helper.s
+++ b/bolt/test/X86/Inputs/dwarf5-df-mono-helper.s
@@ -1,3 +1,14 @@
+# clang++ -g -gdwarf-5 -emit-llvm -S helper.cpp
+# llc -O0 -mtriple=x86_64-unknown-linux-gnu helper.ll
+# int z = 0;
+# int d = 0;
+#
+# int helper(int z_, int d_) {
+#  z += z_;
+#  d += d_;
+#  return z * d;
+# }
+
 	.text
 	.file	"helper.cpp"
 	.file	0 "." "helper.cpp" md5 0xe635924a35b65444173d0c76a54b866f
diff --git a/bolt/test/X86/Inputs/dwarf5-df-mono-main.s b/bolt/test/X86/Inputs/dwarf5-df-mono-main.s
--- a/bolt/test/X86/Inputs/dwarf5-df-mono-main.s
+++ b/bolt/test/X86/Inputs/dwarf5-df-mono-main.s
@@ -1,3 +1,20 @@
+# clang++ -g -gdwarf-5 -gsplit-dwarf=split -emit-llvm -S  main.cpp
+# llc -O0 -mtriple=x86_64-unknown-linux-gnu main.ll
+# void use(int * x, int * y) {
+# *x += 4;
+# *y -= 2;
+# }
+#
+# int helper(int z_, int d_);
+# int x = 0;
+# int y = 1;
+# int  main(int argc, char *argv[]) {
+#    x = argc;
+#    y = argc + 3;
+#    use(&x, &y);
+#    return helper(x, y);
+# }
+
 	.text
 	.file	"main.cpp"
 	.file	0 "." "main.cpp" md5 0x1f627913a0daee879e00a3a51726f0ef
diff --git a/bolt/test/X86/dwarf5-df-dualcu.test b/bolt/test/X86/dwarf5-df-dualcu.test
--- a/bolt/test/X86/dwarf5-df-dualcu.test
+++ b/bolt/test/X86/dwarf5-df-dualcu.test
@@ -111,7 +111,6 @@
 ; BOLT-DWO-MAIN-NEXT: DW_AT_frame_base [DW_FORM_exprloc]	(DW_OP_reg6 RBP)
 ; BOLT-DWO-MAIN-NEXT: DW_AT_name [DW_FORM_strx1]	(indexed (00000005) string = "main")
 
-
 ; PRE-BOLT-DWO-HELPER: version = 0x0005
 ; PRE-BOLT-DWO-HELPER: DW_TAG_variable [2]
 ; PRE-BOLT-DWO-HELPER-NEXT: DW_AT_name [DW_FORM_strx1]	(indexed (00000000) string = "z")