rnk added inline comments.

================
Comment at: lib/CodeGen/CGExprComplex.cpp:204-206
+    Scope.ensureDominatingValue(&Vals.first);
+    Scope.ensureDominatingValue(&Vals.second);
+    Scope.ForceCleanup();
----------------
rsmith wrote:
> I'm a little concerned about the loose connection between 
> `ensureDominatingValue` and `ForrceCleanup` here -- if you forget the 
> `ForceCleanup`, you get silent misbehavior. How about removing 
> `ensureDominatingValue` and instead passing a 
> `std::initializer_list<Value**>` to `ForceCleanup`?
Done.


================
Comment at: lib/CodeGen/CodeGenFunction.h:539
   private:
+    SmallVector<llvm::Value **, 1> ValuesToReload;
 
----------------
rsmith wrote:
> If you keep a `SmallVector` here, set its inline size to 2 to avoid 
> allocations for the `_Complex` case.
I removed it. Also, who wants to waste a whole pointer of stack space for 
_Complex expression evaluation. ;)


https://reviews.llvm.org/D30590



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