saveargs: Implement as libsaveargs

          --- old/usr/src/common/saveargs/tests/README
          +++ new/usr/src/lib/libsaveargs/tests/README
   1    1  testmatch:
   2    2  
   3    3     A stub program that tests the saveargs matcher against a variety of
   4    4     function prologues (assembled from data.s)
   5    5  
   6    6  functional:
   7    7  
   8    8     Actually test the full chunk of the (libproc) side of the code, running
   9    9     pstack on the range of test apps.
       10 +
       11 +dump:
       12 +
       13 +    Display each function in a given object we believe to have saved
       14 +    arguments.
    

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