[MC][CodeGen] Add --large-eh-encoding flag for x86_64 & Aarch64 ELF (#174508) Add a --large-eh-encoding option that forces 8-byte (DW_EH_PE_sdata8) pointer encodings for all x86_64 & aarch64 ELF EH sections: FDE CFI encoding, personality, LSDA, and TType encodings. This is useful for large binaries where .text may exceed 2GB, causing relocation overflows in .eh_frame and .gcc_except_table even under the small or medium code model. The cost is purely in section size (a few extra bytes per FDE/LSDA entry) with no runtime performance impact.
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