[clang] Revert "Mix bits in FileID::getHashValue() (#223794)" (PR #224394)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Akira Hatanaka (ahatanak)

<details>
<summary>Changes</summary>

This reverts commit 9bc655d2852ec31199f2dba25d6f0749953fbe51.

It broke a couple of tests in clang/test/Analysis/html_diagnostics.

---
Full diff: https://github.com/llvm/llvm-project/pull/224394.diff


1 Files Affected:

- (modified) clang/include/clang/Basic/SourceLocation.h (+1-4) 


``````````diff
diff --git a/clang/include/clang/Basic/SourceLocation.h b/clang/include/clang/Basic/SourceLocation.h
index b83ee383d45c0..b42b7e78622c6 100644
--- a/clang/include/clang/Basic/SourceLocation.h
+++ b/clang/include/clang/Basic/SourceLocation.h
@@ -53,10 +53,7 @@ class FileID {
   bool operator>=(const FileID &RHS) const { return RHS <= *this; }
 
   static FileID getSentinel() { return get(-1); }
-  unsigned getHashValue() const {
-    // Multiply by 37 to spread the keys to avoid clustering in DenseMap.
-    return static_cast<unsigned>(ID) * 37U;
-  }
+  unsigned getHashValue() const { return static_cast<unsigned>(ID); }
 
 private:
   friend class ASTWriter;

``````````

</details>


https://github.com/llvm/llvm-project/pull/224394