Add loongarch architecture LSX support.

Zang Ruochenrequested to merge
zangruochen/eigen:master into master

Test platform: LoongArch64 / loongnix-20.4

Overall test results (make check):

99% tests passed, 1 tests failed out of 1205

Label Time Summary.

Official = 779.84 sec*proc (865 tests)

Unsupported = 213.71 sec*proc (226 tests)

Unsupported = 213.71 secproc (226 tests) smoketest = 66.06 secproc (110 tests)

Total Test time (real) = 1500.08 sec

The following tests FAILED.

454 - qr_colpivoting_5 (Child aborted)

Failed single test result (ctest -R qr_colpivoting_5):

1/1 Test 454 : qr_colpivoting_5 ................. Passed 0.00 sec

The following tests passed.

qr_colpivoting_5

100% tests passed, 0 tests failed out of 1 release_test.log qr_colpivoting_5.log

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