[PATCH] Do not use "1" in linemarker for main file in -frewrite-includes

[Lubos Lunak]

 The -frewrite-includes flag incorrectly uses at the beginning a linemarker 
for the main file with the "1" flag which suggests that the contents have 
been in fact included from another file. This for example 
disables -Wunused-macros, which warns only for macros from the main file:

$ cat a.cpp
#define FOO 1
$ clang++ -E -frewrite-includes a.cpp | clang++ -Wall -Wunused-macros -x 
c++ -c -
$ clang++ -Wall -Wunused-macros -c a.cpp
a.cpp:1:9: warning: macro is not used [-Wunused-macros]
#define FOO 1
        ^
1 warning generated.

 The attached patch fixes the code to start the resulting file with the 
correct linemarker.

-- 
 Lubos Lunak
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