[preprocessor] Enhance PreprocessingRecord to keep track of locations of conditional directives.

Introduce PreprocessingRecord::rangeIntersectsConditionalDirective() which returns
true if a given range intersects with a conditional directive block.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152018 91177308-0d34-0410-b5e6-96231b3b80d8
8 files changed