Merge pull request #5886 from Michael137/bugfix/lldb-dylib-reload-build-fix-to-20220421

[lldb][Test] TestRerunAndExpr.py: explicitly delete a.out before rebuilding it

Author: Michael137

lldb/test/API/functionalities/rerun_and_expr_dylib/TestRerunAndExprDylib.py

@@ -52,6 +52,9 @@ def test(self):
                 ValueCheck(name='m_val', value='42')
             ])
 
+        # Delete the dylib to force make to rebuild it.
+        remove_file(self.getBuildArtifact(FULL_DYLIB_NAME))
+
         # Re-build libfoo.dylib
         self.build(dictionary={'DYLIB_CXX_SOURCES':'rebuild.cpp',
                                'DYLIB_ONLY':'YES',