[AArch64] Remove following .inst/after directive from AsmParser diagn…

…ostics

The part of the diagnostic is not useful because the instruction line is
printed. The new style follows generic code.

llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp

@@ -7044,8 +7044,7 @@ bool AArch64AsmParser::parseDirectiveInst(SMLoc Loc) {
 //   ::= .tlsdesccall symbol
 bool AArch64AsmParser::parseDirectiveTLSDescCall(SMLoc L) {
   StringRef Name;
-  if (check(getParser().parseIdentifier(Name), L,
-            "expected symbol after directive") ||
+  if (check(getParser().parseIdentifier(Name), L, "expected symbol") ||
       parseToken(AsmToken::EndOfStatement))
     return true;