[clang] [ObjC] Fix Assertion failure when merging declarations with different lifetime qualifiers (PR #203272)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Hendrik Hübner  (HendrikHuebner)

<details>
<summary>Changes</summary>

Fixes #<!-- -->150403

cc: @<!-- -->rjmccall 

---
Full diff: https://github.com/llvm/llvm-project/pull/203272.diff


1 Files Affected:

- (modified) clang/lib/AST/ASTContext.cpp (+2-1) 


``````````diff
diff --git a/clang/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
index abf0cd5e18c2b..e936572458444 100644
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -12356,7 +12356,8 @@ QualType ASTContext::mergeObjCGCQualifiers(QualType LHS, QualType RHS) {
   if (LQuals != RQuals) {
     // If any of these qualifiers are different, we have a type mismatch.
     if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() ||
-        LQuals.getAddressSpace() != RQuals.getAddressSpace())
+        LQuals.getAddressSpace() != RQuals.getAddressSpace() ||
+        LQuals.getObjCLifetime() != RQuals.getObjCLifetime())
       return {};
 
     // Exactly one GC qualifier difference is allowed: __strong is

``````````

</details>


https://github.com/llvm/llvm-project/pull/203272