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.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142106 91177308-0d34-0410-b5e6-96231b3b80d8

utils/FileCheck/FileCheck.cpp

@@ -384,7 +384,7 @@ void Pattern::PrintFailureInfo(const SourceMgr &SM, StringRef Buffer,
       }
 
       SM.PrintMessage(SMLoc::getFromPointer(Buffer.data()), OS.str(), "note",
-                      /*ShowLine=*/false);
+                      ArrayRef<SMRange>(), /*ShowLine=*/false);
     }
   }