8333871: check sysinfo return values

[MBaesken]

In the review of JDK-8333522 it has been discussed that we might run into issues because of failing sysinfo.
However we miss checking the return values at some places, this might need adjustment.

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Issue

• JDK-8333871: check sysinfo return values (Bug - P4)

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[mlbridge]

Webrevs

• 01: Full - Incremental (e9d2b1b4)
• 00: Full (2d574f7c)

[AlanBateman]

Would you mind checking the code that puts this in a system property can tolerate NULL? I don't suppose sysinfo will fail here (unless you found a case?) but it would be good to confirm that it won't blow up somewhere else.

[MBaesken]

We do PUTPROP here

jdk/src/java.base/share/native/libjava/System.c

Line 164 in 5d65c23

PUTPROP(propArray, _sun_cpu_isalist_NDX, sprops->cpu_isalist);

with 3rd parameter == NULL in this case.
PUTPROP checks for this so I do not see issues with this

jdk/src/java.base/share/native/libjava/System.c

Line 68 in 5d65c23

#define PUTPROP(array, prop_index, val) \