x86/x86-64: Clean up intrinsic codegen for SSE4.1.

Let the normal codegen handle the calls if we're not
emitting intrinsics because of lack of SSE4.1 support.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Change-Id: Ic26e65974231bbcb44ad696100e1fa4469165e41
2 files changed