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

tools/opt/opt.cpp

@@ -505,7 +505,7 @@ int main(int argc, char **argv) {
   M.reset(ParseIRFile(InputFilename, Err, Context));
 
   if (M.get() == 0) {
-    Err.Print(argv[0], errs());
+    Err.print(argv[0], errs());
     return 1;
   }