[PATCH 0/4] rs6000, remove redundant built-ins and add more test cases

[Carl Love]

GCC maintainers:

The following series of patches for PowerPC removes some built-ins that 
are covered by existing overloaded built-ins.  Additionally, there are 
patches to add missing testcases and documentation.

The patch series has been tested on Power 10 LE and BE with no regressions.

Please let me know if the patches are acceptable for mainline. Thanks.

                                        Carl