[PATCH] Fix PR sanitizer/78270 (part 2)

[Martin Liška]

Hello.

Due to a stupid mistake I did, following patch is needed for the test-case
to properly save previous gimplify_ctxp->live_switch_vars.

Patch can bootstrap on ppc64le-redhat-linux and survives regression tests.
I was able to run asan bootstrap on x86_64-linux-gnu and kernel build with
allyesconfig works fine.

Ready to be installed?
Martin
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