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b8f6f9e741
Currently, unary expressions involving valarray will create a temporary. This leads to dangling references in expressions like `-a * b`, because `-a` is a temporary and the resulting expression will refer to it. This patch fixes the problem by creating a lazy expression to perform the unary operation instead of eagerly creating a temporary valarray. This is permitted by the Standard, which does not specify the exact type of most expressions involving valarrays. This is technically an ABI break, however I believe the actual potential for breakage is very low. rdar://90152242 Differential Revision: https://reviews.llvm.org/D125019