[NFC] Update span unit tests for bounds check optimizations #79222
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Add -O to the compilation of SpanExtras and update check lines especially check lines for llvm's vectorization with the updated version.
Using -O during module compilation is important because of how preconditions are lowered in -Onone vs -O. Even though we run optimizations on an imported module, it is important to use -O for module compilation especially when we are analyzing optimization variations.