[clang-tools-extra] [clangd] Fix hang in include-cleaner (PR #215980)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang-tools-extra

Author: Alexander Shaposhnikov (alexander-shaposhnikov)

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<summary>Changes</summary>

Address FIXME in computeIncludeCleanerFindings: locations inside the
preamble patch are mapped back into the main file via their presumed locations.
This fixes hang in include-cleaner when mapping refs through a stale preamble.

Test plan: ninja check-all

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Full diff: https://github.com/llvm/llvm-project/pull/215980.diff


2 Files Affected:

- (modified) clang-tools-extra/clangd/IncludeCleaner.cpp (+23-4) 
- (modified) clang-tools-extra/clangd/unittests/IncludeCleanerTests.cpp (+61) 


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https://github.com/llvm/llvm-project/pull/215980