[debuginfo-tests] [dexter] Add tests to check debug experience

[n-omer]

Summary

This diff adds two debug experience tests:

• deferred_globals.cpp: Verify that debug information for a local variable does not hide a global definition that has the same name

• namespace.cpp: Ensure that the debug information for a global variable includes namespace information.

These test are dexter tests.

[aprantl]

This looks like a good start. What would you think about clang-formatting the tests using the LLVM style?

[n-omer]

Format code with clang-format LLVM style.

Thanks @aprantl.

[TWeaver]

Hi Nabeel,

thanks for this - I'll get this committed for you.

[TWeaver]

fix for any builds that don't have lldb available:

https://reviews.llvm.org/rGf2f4554f88040954ec0059764ef412a97ce5f19a

debuginfo-tests/dexter-tests/deferred_globals.cpp

+// Purpose:
+// Ensure that debug information for a local variable does not hide
+// a global definition that has the same name.
+
+// UNSUPPORTED: system-windows
+
+// RUN: %dexter --fail-lt 1.0 -w \
+// RUN:     --builder 'clang' --debugger 'lldb' \
+// RUN:     --cflags "-g -O0" -v -- %s
+
+const int d = 100;
+
+extern int foo();
+
+int main() {
+  const int d = 4;
+  const float e = 4; // DexLabel("main")
+  const char *f = "Woopy";
+  return d + foo();
+}
+
+int foo() {
+  return d; // DexLabel("foo")
+}
+
+// DexExpectWatchValue('d', '4', on_line='main')
+// DexExpectWatchValue('d', '100', on_line='foo')
+

debuginfo-tests/dexter-tests/namespace.cpp

+// Purpose:
+// Ensure that the debug information for a global variable includes
+// namespace information.
+
+// UNSUPPORTED: system-windows
+
+// RUN: %dexter --fail-lt 1.0 -w \
+// RUN:     --builder 'clang' --debugger 'lldb' \
+// RUN:     --cflags "-g -O0" -v -- %s
+
+#include <stdio.h>
+
+namespace monkey {
+const int ape = 32;
+}
+
+int main() {
+  printf("hello %d\n", monkey::ape); // DexLabel('main')
+  return 0;
+}
+
+// DexExpectWatchValue('monkey::ape', 32, on_line='main')
+