Go patch committed: Use __builtin_unwind_init

[Ian Lance Taylor]

The Go runtime library used a hack, SAVE_REGS, to force all callee-saved
registers to be saved on the stack, so that the garbage collector can
see them reliably.  Joseph pointed out in a comment in PR 46964 that the
__builtin_unwind_init function does the same thing.  This is in fact
what the Boehm garbage collector does.  This patch uses the builtin
function rather than the SAVE_REGS hack.  This fixes PRs 46959, 46960,
46961, 46962, 46963, and 46964, which are about different targets
failing to define SAVE_REGS.  Bootstrapped and ran Go testsuite on
x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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