Sink getDwarfRegNum, getLLVMRegNum, getSEHRegNum from TargetRegisterInfo down
to MCRegisterInfo. Also initialize the mapping at construction time.

This patch eliminate TargetRegisterInfo from TargetAsmInfo. It's another step
towards fixing the layering violation.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135424 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCParser/AsmParser.cpp b/lib/MC/MCParser/AsmParser.cpp
index 0c181f3..055d94c 100644
--- a/lib/MC/MCParser/AsmParser.cpp
+++ b/lib/MC/MCParser/AsmParser.cpp
@@ -2416,7 +2416,7 @@
     if (getParser().getTargetParser().ParseRegister(RegNo, DirectiveLoc,
       DirectiveLoc))
       return true;
-    Register = getContext().getTargetAsmInfo().getDwarfRegNum(RegNo, true);
+    Register = getContext().getRegisterInfo().getDwarfRegNum(RegNo, true);
   } else
     return getParser().ParseAbsoluteExpression(Register);