[lld] Fill section gaps with trap instructions (#176845) Fills unused parts of code segments with trap instructions instead of zeroes. This is especially useful on x86-64 since 0x00 0x00 is a two-byte instruction that performs a memory access. Benefits: - Provides an explicit trap when executing invalid code. - Required for security reasons when targeting LFI. - Makes disassembling easier, especially without symbol information. Previously an odd number of zero bytes between sections could cause a disassembler to incorrectly disassemble the remainder of the program.
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