[flang][Lower] Fix UB in location handling (#177944) Previously `prov` received the address of a variable allocated in stack memory (the contents of `include`). `prov` would then access that memory outside of the lifetime of that stack allocation: leading to UB. This only manifested on thinLTO builds. No added test because flang/test/Lower/location.f90 covers it (when thinLTO is enabled) and there are bots guarding the thin-lto configuration. Fixes #156629 Fixes #176404
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