Eliminate redundant guard variables.
Eliminate redundant guard variables.

We only need to guard the static initializer for the initialized array.  We do
not need to guard the result of thread_safe_getenv, as these are used once and
never reused.

PiperOrigin-RevId: 342925190
Change-Id: Ic3905496f5f1b4cb56a74766751a89f7837478d5

google/tcmalloc,google/tcmalloc,google/tcmalloc