libgo patch committed: Fix hash function for big-endian 32bit systems

[Ian Lance Taylor]

This libgo patch fixes the identity hash function for big-endian 32-bit
systems.  Before this patch the hash code for a 32-bit value always
turned out to be zero on a big-endian 32-bit system.  This patch fixes
the problem.  Bootstrapped and ran Go testsuite on
x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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