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461274b81d
This include 2 fixes:
1. Disallow 'f' for softfloat.
2. Allow 'r' for softfloat.
Currently, 'f' is accpeted by clang, then LLVM meets an internal error.
'r' is rejected by LLVM by: couldn't allocate input reg for constraint
'r'.
Fixes: #64241, #63632
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Co-authored-by: Fangrui Song <i@maskray.me>
(cherry picked from commit c88beb4112d5bbf07d76a615ab7f13ba2ba023e6)
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