MC/AsmParser: Lift Run() and TargetParser to base class.

Also, add constructor function for creating AsmParser instances.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108604 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCParser/MCAsmParser.cpp b/lib/MC/MCParser/MCAsmParser.cpp
index bee3064..39233ae 100644
--- a/lib/MC/MCParser/MCAsmParser.cpp
+++ b/lib/MC/MCParser/MCAsmParser.cpp
@@ -12,14 +12,21 @@
 #include "llvm/MC/MCParser/MCAsmLexer.h"
 #include "llvm/MC/MCParser/MCParsedAsmOperand.h"
 #include "llvm/Support/SourceMgr.h"
+#include "llvm/Target/TargetAsmParser.h"
 using namespace llvm;
 
-MCAsmParser::MCAsmParser() {
+MCAsmParser::MCAsmParser() : TargetParser(0) {
 }
 
 MCAsmParser::~MCAsmParser() {
 }
 
+void MCAsmParser::setTargetParser(TargetAsmParser &P) {
+  assert(!TargetParser && "Target parser is already initialized!");
+  TargetParser = &P;
+  TargetParser->Initialize(*this);
+}
+
 const AsmToken &MCAsmParser::getTok() {
   return getLexer().getTok();
 }