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Join ':' and ';' IR operators

These operators can be joined because at the end in both
cases you have an assignation, so if we join them it is
easier to generate a SSA alike representation.

--- a/cc1/code.c

+++ b/cc1/code.c

@@ -23,8 +23,8 @@

 	[OADD] = "+",

 	[OSUB] = "-",

 	[OMUL] = "*",

-	[OINC] = ";+",

-	[ODEC] =  ";-",

+	[OINC] = ":i",

+	[ODEC] =  ":d",

 	[OPTR] = "@",

 	[OMOD] = "%",

 	[ODIV] = "/",

@@ -64,7 +64,7 @@

 	[OBRANCH] = "\tj\tL%d",

 	[OEFUN] = "}\n",

 	[OELOOP] = "\tb\n",

-	[OBLOOP] = "\td\n",

+	[OBLOOP] = "\te\n",

 	[ORET] = "\tr",

 	[OPAR] = "p",

 	[OCALL] = "c",

--- a/cc1/ir.md

+++ b/cc1/ir.md

@@ -176,8 +176,8 @@

 * :& -- bitwise and and assign

 * :^ -- bitwise xor and assign

 * :| -- bitwise or and assign

-* ;+ -- post increment

-* ;- -- post decrement

+* :i -- post increment

+* :d -- post decrement

 Every operator in an expression has a type descriptor.

@@ -267,7 +267,7 @@

 of a loop:

 * b -- begin of loop

-* d -- end of loop

+* e -- end of loop

 #### Switch statement ####