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[mips] Check that features required by built-ins are enabled

Authored by atanasyan on Nov 27 2019, 8:09 AM.

Description

[mips] Check that features required by built-ins are enabled

Now Clang does not check that features required by built-in functions
are enabled. That causes errors in the backend reported in PR44018.

This patch fixes this bug by checking that required features
are enabled.

This should fix PR44018.

Differential Revision: https://reviews.llvm.org/D70808