Revert patch that disabled exporting of global ranges.

Revert patch that disabled exporting of global ranges.

Andrew's last set of changes fixes the bootstrap problem on i686 when
global ranges are exported from evrp.  The specific patch that fixes the
problem is 715914d3:

	Author: Andrew MacLeod <amacleod@redhat.com>
	Date:   Mon May 31 12:13:50 2021 -0400

	    Do not calculate new values when evaluating a debug statement.

	    Add a flag to enable/disable immediately improving poor values found during
	    cache propagation. Then disable it when processing debug statements.

This patch reverts commit 2364b58 now that exporting of global ranges works.

Tested on x86-64 Linux with default flags, and on i686 with the flags in
the PR: --enable-clocale=gnu --with-system-zlib --with-demangler-in-ld --with-fpmath=sse --enable-languages=c,c++ --enable-cet i686-linux --enable-bootstrap --with-fpmath=sse --disable-libcc1 --disable-libcilkrts --disable-libsanitizer

gcc/ChangeLog:

	* gimple-ssa-evrp.c: Enable exporting of global ranges.

gcc/testsuite/ChangeLog:

	* gcc.dg/Wstringop-overflow-55.c: Adjust for global ranges changes.
	* gcc.dg/pr80776-1.c: Same.