Add and use readLE/writeLE helpers#8470
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According to godbolt.org these functions optimize to a simple *(T *)ptr in many cases while ensuring that memory alignment requirements and endianess does not effect the behavior. The unroll pragma is needed for GCC to properly optimize the code. The approach of using bit shifts is also used in multiple other parts of binaryen (eg. WasmBinaryReader::getInt16) but usage of the helper function doesn't seem to be that easy there. Ref WebAssembly#2983
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According to godbolt.org these functions optimize to a simple
*(T *)ptrin many cases while ensuring that memory alignment requirements and endianess does not effect the behavior.The unroll pragma is needed for GCC to properly optimize the code.
The approach of using bit shifts is also used in multiple other parts of binaryen (eg.
WasmBinaryReader::getInt16) but usage of the helper function doesn't seem to be that easy there.Ref #2983