[LLVM][CLANG] Update signal-handling behavior to comply with POSIX#169340

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xingxue-ibm wants to merge 1 commit intollvm:mainfrom

xingxue-ibm:fix-signals

Commits on Nov 24, 2025

Don't install signal handler if the disposition of a signal is SIG_IGN, resignal after the signal handler handles a signal so the exit code of the compiler contains the signal number.
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