[XLC++] use builtin functions
-----------------------------

                 Key: STDCXX-732
                 URL: https://issues.apache.org/jira/browse/STDCXX-732
             Project: C++ Standard Library
          Issue Type: Improvement
          Components: Build
    Affects Versions: 4.2.0
         Environment: IBM XLC++
            Reporter: Martin Sebor


As Travis suggests in his 
[comment|http://issues.apache.org/jira/browse/STDCXX-722?focusedCommentId=12568684#action_12568684]
 on STDCXX-722, we should make use of XLC++ built-ins the same way we are 
taking advantage of gcc intrinsics.

The book [Built-in functions for POWER and PowerPC 
architectures|http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.xlcpp8a.doc/compiler/ref/rubifunc.htm]
 outlines the set of built-in functions available in the IBM XLC++ compiler on 
PowerPC.

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