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Fix lib/msun's ctrig_test/test_inf_inputs test case with clang >= 10

Description

Fix lib/msun's ctrig_test/test_inf_inputs test case with clang >= 10

This sprinkles a few strategic volatiles in an attempt to defeat clang's
optimization interfering with the expected floating-point exception
flags.

Reported by: lwhsu
PR: 244732
MFC after: 3 days