[RISCV] Use 'riscv-isa' module flag to set ELF flags and attributes. (#85155)
Walk all the ISA strings and set the subtarget bits for any extension we
find in any string.
This allows LTO output
[RISCV] Use 'riscv-isa' module flag to set ELF flags and attributes. (#85155)
Walk all the ISA strings and set the subtarget bits for any extension we
find in any string.
This allows LTO output to have a ELF attributes from the union of all of
the files used to compile it.
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