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[loongarch][DAG][FREEZE] Fix crash when FREEZE a half(f16) type on lo…
…ongarch (#107791) For zig with LLVM 19.1.0rc4, we are seeing the following error when bootstrapping a `loongarch64-linux-musl` target. ziglang/zig-bootstrap#164 (comment) It seems that this issue is caused by `PromoteFloatResult` is not handling FREEZE OP on loongarch. Here is the reproduction of the error: https://godbolt.org/z/PPfvWjjG5 ~~This patch adds the FREEZE OP handling with `PromoteFloatRes_UnaryOp` and adds a test case.~~ This patch changes loongarch's way of floating point promotion to soft promotion to avoid this problem. See: loongarch's handling of `half`: - #93894 - #94456 Also see: other float promotion FREEZE handling - 0019c2f
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