Change check for embedded llvm version number to a regex to make test more flexible. (#79528) #79642
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This test started to fail when LLVM created the release/18.x branch and the main branch subsequently had the version number increased from 18 to 19.
I investigated this failure (it was blocking our internal automation) and discovered that the CHECK statement on line 27 seemed to have the compiler version number (1800) encoded in octal that it was checking for. I don't know if this is something that explicitly needs to be checked, so I am leaving it in, but it should be more flexible so the test doesn't fail anytime the version number is changed. To accomplish that, I changed the check for the 4-digit version number to be a regex.
I originally updated this test for the 18->19 transition in a01195f. This change makes the CHECK line more flexible so it doesn't need to be continually updated.
(cherry picked from commit 45f883e)