llvm-project

1762e01c - Fix codegen of consteval functions returning an empty class, and related issues (#93115)

Fix codegen of consteval functions returning an empty class, and related issues (#93115) Fix codegen of consteval functions returning an empty class, and related issues If a class is empty, don't store it to memory: the store might overwrite useful data. Similarly, if a class has tail padding that might overlap other fields, don't store the tail padding to memory. The problem here turned out a bit more general than I initially thought: basically all uses of EmitAggregateStore were broken. Call lowering had a method that did mostly the right thing, though: CreateCoercedStore. Adapt CreateCoercedStore so it always does the conservatively right thing, and use it for both calls and ConstantExpr. Also, along the way, fix the "overlap" bit in AggValueSlot: the bit was set incorrectly for empty classes in some cases. Fixes #93040.