Improve the diagnostics of the number-reading preprocessor directives.
The GNU line marker directive was sharing code with the #line directive, but some of the warnings/errors were reporting as #line directive diagnostics in both cases.
Previously:
#line 11foo1 ==> "#line directive requires a simple digit sequence"
# 11foo1 ==> "#line directive requires a simple digit sequence"
Now, we get:
#line 11foo1 ==> "#line directive requires a simple digit sequence"
# 11foo1 ==> "GNU line marker directive requires a simple digit sequence"
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179139
91177308-0d34-0410-b5e6-
96231b3b80d8