[MCTargetAsmParser] Move the member varialbes that reference
MCSubtargetInfo in the subclasses into MCTargetAsmParser and define a
member function getSTI.

This is done in preparation for making changes to shrink the size of
MCRelaxableFragment. (see http://reviews.llvm.org/D14346).

llvm-svn: 253124
diff --git a/llvm/lib/MC/MCParser/MCTargetAsmParser.cpp b/llvm/lib/MC/MCParser/MCTargetAsmParser.cpp
index 0810449..234b3b6 100644
--- a/llvm/lib/MC/MCParser/MCTargetAsmParser.cpp
+++ b/llvm/lib/MC/MCParser/MCTargetAsmParser.cpp
@@ -7,13 +7,20 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCTargetAsmParser.h"
 using namespace llvm;
 
-MCTargetAsmParser::MCTargetAsmParser(MCTargetOptions const &MCOptions)
-  : AvailableFeatures(0), ParsingInlineAsm(false), MCOptions(MCOptions)
+MCTargetAsmParser::MCTargetAsmParser(MCTargetOptions const &MCOptions,
+                                     MCSubtargetInfo &STI)
+  : AvailableFeatures(0), ParsingInlineAsm(false), MCOptions(MCOptions),
+    STI(STI)
 {
 }
 
 MCTargetAsmParser::~MCTargetAsmParser() {
 }
+
+const MCSubtargetInfo &MCTargetAsmParser::getSTI() const {
+  return STI;
+}