When diagnosing suspicious precedence or assignments, move the fix-it

that adds parentheses from the main diagnostic down to a new
note. This way, when the fix-it represents a choice between two
options, each of the options is associted with a note. There is no
default option in such cases. For example:

/Users/dgregor/t.c:2:9: warning: & has lower precedence than ==; ==
will be
      evaluated first [-Wparentheses]
  if (x & y == 0) {
        ^~~~~~~~
/Users/dgregor/t.c:2:9: note: place parentheses around the &
expression to
      evaluate it first
  if (x & y == 0) {
        ^
      (    )
/Users/dgregor/t.c:2:9: note: place parentheses around the ==
expression to
      silence this warning
  if (x & y == 0) {
        ^
          (     )

llvm-svn: 101249

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