[llvm] Reland "[ThinLTO][Bitcode] Generate import type in bitcode" (PR #97253)

[Jan Voung via llvm-commits]

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@@ -453,11 +458,16 @@ class IndexBitcodeWriter : public BitcodeWriterBase {
   /// Constructs a IndexBitcodeWriter object for the given combined index,
   /// writing to the provided \p Buffer. When writing a subset of the index
   /// for a distributed backend, provide a \p ModuleToSummariesForIndex map.
+  /// If provided, \p ModuleToDecSummaries specifies the set of summaries for
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jvoung wrote:

nit: DecSummaries?

https://github.com/llvm/llvm-project/pull/97253