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per clang's document, -Og is like -O1, which is in turn an optimization level between -O0 and -O2. -O0 "generates the most debuggable code". for instance, with -O0, presumably, the variables are not allocated in the registers and later get overwritten, they are always allocated on the stack. this helps with the debugging. in this change, -O0 is used for better debugging experience. the downside is that the emitted code size will be greater than the one emitted from -Og, and the executable will be slower. Signed-off-by: Kefu Chai <kefu.chai@scylladb.com> Closes #14210