Enhance llvm::SourceMgr to support diagnostic ranges, the same way clang does.  Enhance
the X86 asmparser to produce ranges in the one case that was annoying me, for example:

test.s:10:15: error: invalid operand for instruction
movl 0(%rax), 0(%edx)
              ^~~~~~~

It should be straight-forward to enhance filecheck, tblgen, and/or the .ll parser to use 
ranges where appropriate if someone is interested.

llvm-svn: 142106
diff --git a/llvm/utils/FileCheck/FileCheck.cpp b/llvm/utils/FileCheck/FileCheck.cpp
index f225594..eb61cb3 100644
--- a/llvm/utils/FileCheck/FileCheck.cpp
+++ b/llvm/utils/FileCheck/FileCheck.cpp
@@ -384,7 +384,7 @@
       }
 
       SM.PrintMessage(SMLoc::getFromPointer(Buffer.data()), OS.str(), "note",
-                      /*ShowLine=*/false);
+                      ArrayRef<SMRange>(), /*ShowLine=*/false);
     }
   }