Several lit tests are failing on macOS, as they are linux-specific,
but not using the "REQUIRES: system-linux" setting.
This patch adds the missing requirements to tests failing on macOS.
The intention is to check a section name different from
.gcc_except_table . Rather than using a linker script, use llvm-objcopy
--rename-section instead.
The LTO flag is not needed for the test to work properly. However, it
may not build on a system where compiler and linker versions don't match
one another. Remove the LTO flag.
