Introduce support for location views

[Nick Clifton]

Hi Alex,

> Fixed with the incremental patch below.

Thanks - with that applied I was able to build the patched sources.  Unfortunately
this revealed the next problem - new gas testsuite failures:

Lots of targets (eg: arm-eabi, powerpc64-linux-gnu) are showing:

  GAS REGRESSION: DWARF2 5   
  GAS REGRESSION: DWARF2 11   
  GAS REGRESSION: DWARF2 13   
  GAS REGRESSION: DWARF2 16   
  GAS REGRESSION: DWARF2 17   

MIPS targets are also showing:

  GAS REGRESSION: DWARF2 8   
  GAS REGRESSION: DWARF2 9   
  GAS REGRESSION: MIPS DWARF-2 location information with

The riscv64-elf target also has:

  GAS REGRESSION: undefined symbols un sleb128 directive
  GAS REGRESSION: DWARF2 6   
  GAS REGRESSION: DWARF2 7   
  GAS REGRESSION: DWARF2 10   
  GAS REGRESSION: DWARF2 12   
  GAS REGRESSION: DWARF2 13   
  GAS REGRESSION: DWARF2 15   
  GAS REGRESSION: DWARF2 18   
 
And the SH target is showing:

  GAS REGRESSION: DWARF2 7   
  GAS REGRESSION: DWARF2 8   
  GAS REGRESSION: DWARF2 9   
  GAS REGRESSION: DWARF2 10   
  GAS REGRESSION: DWARF2 12   
  GAS REGRESSION: DWARF2 14   
  GAS REGRESSION: DWARF2 15   
  GAS REGRESSION: DWARF2 18   


I have not looked closely at all of the failures, but I think that they are just
a case of needing some regular expressions to be updated.

Would you mind having a look and fixing them please.  Feel free to ping me if you
want to have a look at the full logs of the failures.

Cheers
  Nick