[ExecutionTests] Fix shader source to prevent OOB access for ExecutionTests::AtomicsShared64Test #7641
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Fixes #5198.
ExecutionTests::AtomicsShared64Test could sporadically fail.
g_sint64Share is indexed with ix%3 + 1, which could lead to an out of bounds access.
Increase the size of g_sint64Share to 4 and ensure all values are initialized.