[WPD]: Enable speculative devirtualizatoin. (#159048) This patch implements the speculative devirtualization feature in the LLVM backend. It handles the case of single implementation devirtualization where there is a single possible callee of a virtual function. - Add cl::opt 'devirtualize-speculatively' to enable it. - Flag is disabled by default. - It works regardless of the visibility of the object. - Not enabled for LTO for now.
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