[clang] [Clang] Add fake use emission to Clang with -fextend-lifetimes (PR #110102)

[Jeremy Morse via cfe-commits]

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@@ -1412,6 +1425,39 @@ void CodeGenFunction::EmitAndRegisterVariableArrayDimensions(
   }
 }
 
+/// Return the maximum size of an aggregate for which we generate a fake use
+/// intrinsic when -fextend-lifetimes is in effect.
+static uint64_t maxFakeUseAggregateSize(const ASTContext &C) {
+  return 4 * C.getTypeSize(C.UnsignedIntTy);
+}
+
+// Helper function to determine whether a variable's or parameter's lifetime
+// should be extended.
+static bool extendLifetime(const ASTContext &Context, const Decl *FuncDecl,
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jmorse wrote:

IMO: this function should be named `shouldExtendLifetime`

https://github.com/llvm/llvm-project/pull/110102