Remove rtl.texi references to old RTX code class names

Committed on behalf of Matthew Malcomson.

2018-08-16  Matthew Malcomson  <matthew.malcomson@arm.com>

gcc/
	* doc/rtl.texi: Replace old RTX class names with new names.

From-SVN: r263592

gcc/ChangeLog

+2018-08-16  Matthew Malcomson  <matthew.malcomson@arm.com>
+
+	* doc/rtl.texi: Replace old RTX class names with new names.
+
+
 2018-08-16  Vlad Lazar  <vlad.lazar@arm.com>
 
 	* expmed.h (canonicalize_comparison): New declaration.

gcc/doc/rtl.texi

@@ -144,7 +144,8 @@ Currently, @file{rtl.def} defines these classes:
 An RTX code that represents an actual object, such as a register
 (@code{REG}) or a memory location (@code{MEM}, @code{SYMBOL_REF}).
 @code{LO_SUM}) is also included; instead, @code{SUBREG} and
-@code{STRICT_LOW_PART} are not in this class, but in class @code{x}.
+@code{STRICT_LOW_PART} are not in this class, but in class
+@code{RTX_EXTRA}.
 
 @item RTX_CONST_OBJ
 An RTX code that represents a constant object.  @code{HIGH} is also
@@ -166,7 +167,7 @@ An RTX code for a unary arithmetic operation, such as @code{NEG},
 @item RTX_COMM_ARITH
 An RTX code for a commutative binary operation, such as @code{PLUS} or
 @code{AND}.  @code{NE} and @code{EQ} are comparisons, so they have class
-@code{<}.
+@code{RTX_COMM_COMPARE}.
 
 @item RTX_BIN_ARITH
 An RTX code for a non-commutative binary operation, such as @code{MINUS},
@@ -284,26 +285,28 @@ Some classes of RTX codes always have the same format.  For example, it
 is safe to assume that all comparison operations have format @code{ee}.
 
 @table @code
-@item 1
+@item RTX_UNARY
 All codes of this class have format @code{e}.
 
-@item <
-@itemx c
-@itemx 2
+@item RTX_BIN_ARITH
+@itemx RTX_COMM_ARITH
+@itemx RTX_COMM_COMPARE
+@itemx RTX_COMPARE
 All codes of these classes have format @code{ee}.
 
-@item b
-@itemx 3
+@item RTX_BITFIELD_OPS
+@itemx RTX_TERNARY
 All codes of these classes have format @code{eee}.
 
-@item i
+@item RTX_INSN
 All codes of this class have formats that begin with @code{iuueiee}.
 @xref{Insns}.  Note that not all RTL objects linked onto an insn chain
-are of class @code{i}.
+are of class @code{RTX_INSN}.
 
-@item o
-@itemx m
-@itemx x
+@item RTX_CONST_OBJ
+@itemx RTX_OBJ
+@itemx RTX_MATCH
+@itemx RTX_EXTRA
 You can make no assumptions about the format of these codes.
 @end table