fix the asmparser so that the target is responsible for skipping to

the end of the line on a parser error, allowing skipping to happen
for syntactic errors but not for semantic errors.  Before we would
miss emitting a diagnostic about the second line, because we skipped
it due to the semantic error on the first line:

  foo %eax
  bar %al

This fixes rdar://8414033 - llvm-mc ignores lines after an invalid instruction mnemonic errors


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113688 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/MC/MCParser/MCAsmParser.h

@@ -99,6 +99,10 @@ public:
   /// will be either the EndOfStatement or EOF.
   virtual StringRef ParseStringToEndOfStatement() = 0;
 
+  /// EatToEndOfStatement - Skip to the end of the current statement, for error
+  /// recovery.
+  virtual void EatToEndOfStatement() = 0;
+  
   /// ParseExpression - Parse an arbitrary expression.
   ///
   /// @param Res - The value of the expression. The result is undefined