update size calculations for assignment statements

this was forgotten when the value lists were extended by a size hint.

Change-Id: I6f9b55ed671224a9b8735c8d937f94aac4a73a42
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>
(cherry picked from qtcreator/f24c9865306624c2fc150d4bd262a5c4d5a3689a)
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>

qmake/library/proitems.h

@@ -275,6 +275,7 @@ enum ProToken {
     TokRemove,          // variable -=
     TokReplace,         // variable ~=
                         // previous literal/expansion is a variable manipulation
+                        // - lower bound for expected output length (1)
                         // - value expression + TokValueTerminator
     TokValueTerminator, // assignment value terminator
     TokLiteral,         // literal string (fully dequoted)

qmake/library/qmakeparser.cpp

@@ -298,12 +298,12 @@ bool QMakeParser::read(ProFile *pro, const QString &in, int line, SubGrammar gra
     // Worst-case size calculations:
     // - line marker adds 1 (2-nl) to 1st token of each line
     // - empty assignment "A=":2 =>
-    //   TokHashLiteral(1) + hash(2) + len(1) + "A"(1) + TokAssign(1) +
-    //   TokValueTerminator(1) == 7 (8)
+    //   TokHashLiteral(1) + hash(2) + len(1) + "A"(1) + TokAssign(1) + 0(1) +
+    //   TokValueTerminator(1) == 8 (9)
     // - non-empty assignment "A=B C":5 =>
-    //   TokHashLiteral(1) + hash(2) + len(1) + "A"(1) + TokAssign(1) +
+    //   TokHashLiteral(1) + hash(2) + len(1) + "A"(1) + TokAssign(1) + 2(1) +
     //   TokLiteral(1) + len(1) + "B"(1) +
-    //   TokLiteral(1) + len(1) + "C"(1) + TokValueTerminator(1) == 13 (14)
+    //   TokLiteral(1) + len(1) + "C"(1) + TokValueTerminator(1) == 14 (15)
     // - variable expansion: "$$f":3 =>
     //   TokVariable(1) + hash(2) + len(1) + "f"(1) = 5
     // - function expansion: "$$f()":5 =>