libgo patch committed: More efficient trampoline allocation

[Ian Lance Taylor]

This patch to libgo makes the implementation of function trampolines,
used for nested functions that refer to variables in an enclosing
function scope, much more efficient.  Previously we were allocating a
separate page for each trampoline.  This patch packs them on a single
page as much as possible.  Bootstrapped and ran Go testsuite on
x86_64-unknown-linux-gnu.  Commited to mainline and 4.7 branch.

Ian

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