Actually rename the file AnalysisContext.cpp -> AnalysisDeclContext.cpp

to match the CMakeLists.txt change in r142782; this should fix the CMake
build.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@142784 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Analysis/AnalysisContext.cpp b/lib/Analysis/AnalysisDeclContext.cpp
similarity index 100%
rename from lib/Analysis/AnalysisContext.cpp
rename to lib/Analysis/AnalysisDeclContext.cpp