[PATCH][ARM] Fix .thumb_func directive in ARMAsmParser

[Gabor Ballabas]

This patch is intended to solve the following FIXME in
ARMAsmParser::parseDirectiveThumbFunc:

  // FIXME: assuming function name will be the line following .thumb_func
  // We really should be checking the next symbol definition even if there's
  // stuff in between.

I didn't add any new test just modified the existing one by moving the
.type directive between the .thumb_func directive
and the actual symbol (you can check it in the diff). This is how GCC
places the directives (at least it did it for me when
I compiled  a simple "Hello world!" C program to assembly code).

I'm looking forward to any suggestion.

Best regards,
Gabor Ballabas
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