[analyzer] NFC: operator new: Fix new(nothrow) definition in tests.
[analyzer] NFC: operator new: Fix new(nothrow) definition in tests.

Fix the const qualifier so that the operator defined in the tests indeed does
override the default global nothrow version of new.

Differential Revision: https://reviews.llvm.org/D41408


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@322790 91177308-0d34-0410-b5e6-96231b3b80d8

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