[basic.pre] Defragment specification of names and entities

The current contents of [basic.pre] jump between specifying
different things.  This PR moves all the specification of
names to the front, followed by the specification of entities.

There are two main benefits: (1) the specification for when
two names are the same is a list of 4 rules that correspond
to the 4 things than can form a name --- the connection is
much clearer when the paragraphs are adjacent and the list
is sorted to the same order; (2) in this form, even though
all the words are the same, the reordering and merging of
paragraphs a fit on a single page.  The very last paragraph
was forced over a page-break in the original layout.

Author: AlisdairM

source/basic.tex

@@ -4,6 +4,11 @@
 \gramSec[gram.basic]{Basics}
 
 \rSec1[basic.pre]{Preamble}
+\indextext{type}%
+\indextext{object}%
+\indextext{storage class}%
+\indextext{scope}%
+\indextext{linkage}%
 
 \pnum
 \begin{note}
@@ -27,22 +32,22 @@
 \end{note}
 
 \pnum
-\indextext{type}%
-\indextext{object}%
-\indextext{storage class}%
-\indextext{scope}%
-\indextext{linkage}%
-An \defn{entity} is a value, object, reference,
-structured binding,
-function, enumerator, type,
-class member, bit-field, template, template specialization, namespace, or
-pack.
+A \defn{name} is an \grammarterm{identifier}\iref{lex.name},
+\grammarterm{conversion-function-id}\iref{class.conv.fct},
+\grammarterm{operator-function-id}\iref{over.oper}, or
+\grammarterm{literal-operator-id}\iref{over.literal}.
 
 \pnum
-A \defn{name} is an \grammarterm{identifier}\iref{lex.name},
-\grammarterm{operator-function-id}\iref{over.oper},
-\grammarterm{literal-operator-id}\iref{over.literal}, or
-\grammarterm{conversion-function-id}\iref{class.conv.fct}.
+Two names are \defnx{the same}{name!same} if
+\begin{itemize}
+\item they are \grammarterm{identifier}{s} composed of the same character sequence, or
+\item they are \grammarterm{conversion-function-id}{s} formed with
+equivalent\iref{temp.over.link} types, or
+\item they are \grammarterm{operator-function-id}{s} formed with
+the same operator, or
+\item they are \grammarterm{literal-operator-id}{s} formed with
+the same literal suffix identifier.
+\end{itemize}
 
 \pnum
 Every name is introduced by a \defn{declaration}, which is a
@@ -85,44 +90,38 @@
 The interpretation of a \grammarterm{for-range-declaration} produces
 one or more of the above\iref{stmt.ranged}.
 \end{note}
-An entity $E$ is denoted by the name (if any)
-that is introduced by a declaration of $E$ or
-by a \grammarterm{typedef-name} introduced by a declaration specifying $E$.
+
+\pnum
+\begin{note}
+Some names denote types or templates.
+In general, whenever a name is encountered
+it is necessary to look it up\iref{basic.lookup}
+to determine whether that name denotes one of these entities
+before continuing to parse the program that contains it.
+\end{note}
 
 \pnum
 A \defn{variable} is introduced by the
 declaration of
 a reference other than a non-static data member or of
 an object. The variable's name, if any, denotes the reference or object.
 
+\pnum
+An \defn{entity} is a value, object, reference,
+structured binding,
+function, enumerator, type,
+class member, bit-field, template, template specialization, namespace, or
+pack. An entity $E$ is denoted by the name (if any)
+that is introduced by a declaration of $E$ or
+by a \grammarterm{typedef-name} introduced by a declaration specifying $E$.
+
 \pnum
 A \defnadj{local}{entity} is a variable with
 automatic storage duration\iref{basic.stc.auto},
 a structured binding\iref{dcl.struct.bind}
 whose corresponding variable is such an entity,
 or the \tcode{*\keyword{this}} object\iref{expr.prim.this}.
 
-\pnum
-\begin{note}
-Some names denote types or templates.
-In general, whenever a name is encountered
-it is necessary to look it up\iref{basic.lookup}
-to determine whether that name denotes one of these entities
-before continuing to parse the program that contains it.
-\end{note}
-
-\pnum
-Two names are \defnx{the same}{name!same} if
-\begin{itemize}
-\item they are \grammarterm{identifier}{s} composed of the same character sequence, or
-\item they are \grammarterm{operator-function-id}{s} formed with
-the same operator, or
-\item they are \grammarterm{conversion-function-id}{s} formed
-with equivalent\iref{temp.over.link} types, or
-\item they are \grammarterm{literal-operator-id}{s}\iref{over.literal} formed with
-the same literal suffix identifier.
-\end{itemize}
-
 \pnum
 \indextext{translation unit!name and}%
 \indextext{linkage}%