gas: correct symbol name comparison in .startof./.sizeof. handling

In 162c6aef1f ("gas: fold symbol table entries generated for
.startof.() / .sizeof.()") I screwed up quite badly, inverting the case
sensitive and case insensitive comparison functions.

gas/expr.c

@@ -149,8 +149,8 @@ symbol_lookup_or_make (const char *name, bool start)
 
     name = S_GET_NAME (symbolP);
     if ((symbols_case_sensitive
-	 ? strcasecmp (buf, name)
-	 : strcmp (buf, name)) == 0)
+	 ? strcmp (buf, name)
+	 : strcasecmp (buf, name)) == 0)
       {
 	free (buf);
 	return symbolP;

gas/testsuite/gas/elf/startof.d

@@ -7,4 +7,6 @@ Symbol table .*
 #...
      [1-8]: 0+ .* UND \.startof\.\.text
      [2-9]: 0+ .* UND \.sizeof\.\.text
+ +[1-9][0-9]*: 0+ .* UND \.startof\.\.Text
+ +[1-9][0-9]*: 0+ .* UND \.sizeof\.\.TEXT
 #pass

gas/testsuite/gas/elf/startof.s

@@ -4,3 +4,6 @@
 	.dc.a	0
 	.dc.a	.sizeof.(.text)
 	.dc.a	.startof.(.text)
+	.dc.a	0
+	.dc.a	.startof.(.Text)
+	.dc.a	.sizeof.(.TEXT)