Fix a couple of layering violations in Transforms

Fix a couple of layering violations in Transforms

Remove #include of Transforms/Scalar.h from Transform/Utils to fix layering.

Transforms depends on Transforms/Utils, not the other way around. So
remove the header and the "createStripGCRelocatesPass" function
declaration (& definition) that is unused and motivated this dependency.

Move Transforms/Utils/Local.h into Analysis because it's used by
Analysis/MemoryBuiltins.cpp.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@328165 91177308-0d34-0410-b5e6-96231b3b80d8