Update ChangeLog for last change

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@279940 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
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 2020-01-06  Michael Meissner  <meissner@linux.ibm.com>
 
+       * config/rs6000/constraints.md (Q constraint): Update
+       documentation.
+       * doc/md.texi (RS/6000 constraints): Update 'Q' cosntraint
+       documentation.
+
        * config/rs6000/vsx.md (vsx_extract_<mode>_var, VSX_D iterator):
        Use 'Q' for doing vector extract from memory.
        (vsx_extract_v4sf_var): Use 'Q' for doing vector extract from