Introduce a V8_NORETURN macro and use it to make GCC 4.9.2 happy again.

Introduce a V8_NORETURN macro and use it to make GCC 4.9.2 happy again.

Without that, it has a few false positives about out-of-bounds array accesses.
Also makes the clang static-analyzer happy.

Original code review from Sven Panne:
https://codereview.chromium.org/790723002/

Review URL: https://codereview.chromium.org/1361763004

Cr-Commit-Position: refs/heads/master@{#30977}