Add tests that trigger DWARF4 vs DWARF5 bug explicitly

Author: grigorypas

bolt/test/X86/Inputs/dwarf5-two-cus-foo.cpp

@@ -0,0 +1,3 @@
+#include <cstdio>
+
+extern "C" void foo() { printf("Hello from second CU!\n"); }

bolt/test/X86/dwarf5-debug-line-print.test

@@ -0,0 +1,14 @@
+// Check that BOLT correctly generates debug line comments for DWARF-5.
+
+// REQUIRES: system-linux
+
+// RUN: %clang -g -gdwarf-5 -O0 -xc++ %s -o %t.exe
+// RUN: llvm-bolt %t.exe --update-debug-sections --print-debug-info \
+// RUN:   --print-after-lowering -o %t.bolt | FileCheck %s
+
+// CHECK: pushq   %rbp # debug line {{.*}}dwarf5-debug-line-print.test:11
+
+int main(){
+  int x = 0;
+  return 0;
+}

bolt/test/X86/dwarf5-two-cus.test

@@ -0,0 +1,20 @@
+// Check that BOLT correctly handles two CUs with DWARF-5 debug info (does not crash).
+
+// REQUIRES: system-linux
+
+// RUN: %clang -g -gdwarf-5 -O1 -xc++ %s -o %t-main.o -c
+// RUN: %clang -g -gdwarf-5 -O1 -xc++ %S/Inputs/dwarf5-two-cus-foo.cpp -o %t-foo.o -c
+// RUN: %clang %t-main.o %t-foo.o -o %t.exe
+// RUN: llvm-bolt %t.exe --update-debug-sections --force-inline=foo \
+// RUN:   -o %t.bolt | FileCheck %s
+
+// CHECK-NOT: BOLT-ERROR
+// CHECK-NOT: BOLT-WARNING
+// CHECK: BOLT-INFO: inlined {{[0-9]+}} calls at {{[1-9][0-9]*}} call sites
+
+extern "C" void foo();
+
+int main() {
+  foo();
+  return 0;
+}