GCC: xtensa: backport patches from upstream #26
Merged
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this PR supersedes #19, #20, #21 and #25, by backporting from upstream:
gcc-mirror/gcc@06ff870 "gcc: xtensa: fix PR target/98285"
gcc-mirror/gcc@64a5450 "gcc: xtensa: rearrange DI mode constant loading"
gcc-mirror/gcc@40bf68b "gcc: xtensa: add optimizations for shift operations"
gcc-mirror/gcc@18e86fa "gcc: xtensa: implement bswapsi2, bswapdi2 and helpers"