[clang-scan-deps] Fix "unterminated conditional directive" bug (#146645)

`clang-scan-deps` threw "unterminated conditional directive" error
falsely on the following example:

```
#ifndef __TEST
#define __TEST

#if defined(__TEST_DUMMY)
 #if defined(__TEST_DUMMY2)
  #pragma GCC warning                                                          \
      "Hello!"
 #else
  #pragma GCC error                                                            \
      "World!"
 #endif // defined(__TEST_DUMMY2)
#endif  // defined(__TEST_DUMMY)

#endif // #ifndef __TEST
```

The issue comes from PR #143950, where the flag `LastNonWhitespace` does
not correctly represent the state for the example above. The PR aimed to
support that a line-continuation can be followed by whitespaces.  
This commit fixes the issue by moving the `LastNonWhitespace` variable
to the inner loop so that it will be correctly reset.

rdar://153742186

0 files changed, 0 insertions, 0 deletions