[libclang] In ASTUnit::getMainFileName() Invocation may be null because the ASTUnit
came from loading a PCH/module.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172259 91177308-0d34-0410-b5e6-96231b3b80d8
[libclang] Add some constness in CXSourceLocation and CXSourceRange.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172261 91177308-0d34-0410-b5e6-96231b3b80d8
[PCH] Make the const_cast explicit to silence a compiler warning.

Patch by David Greene.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172262 91177308-0d34-0410-b5e6-96231b3b80d8
Correctly propagate uninitialized values within logical expressions.

Fixes assertion failure reported in PR 14635 and
<rdar://problem/12902945> respectively.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172263 91177308-0d34-0410-b5e6-96231b3b80d8