RFR: 8257229: gtest death tests fail with unrecognized stderr output

[Ioi Lam]

On Fri, 11 Dec 2020 20:26:41 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> The regexp used by the TEST_VM_ASSERT_MSG macro is too restrictive. It shouldn't require that "assert failed" to be the very beginning of the VM output. Note that the other macro, TEST_VM_ASSERT, does not have the "^" in its regexp.
>
> Ok.

Thanks @coleenp & @yminqi for the review. Tested with mach5 tiers1/2.

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PR: https://git.openjdk.java.net/jdk/pull/1748