Do not use __assume for icc in gcc compatability mode
When using the GNU header files on a system, the icc compiler emulates the behavior of the gcc compiler on the system. (See https:// software.intel.com/en-us/node/522750) This appears to mean that icc features that are not available in gcc could get turned off. In particular, we found that the __assume feature stopped working. To get around this problem, do not use __assume when compiling with icc and __GNUC__ is defined. Instead, use the available gcc features.
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