Relax an assert a bit to avoid a crash on unreachable code.

Patch by Duncan Exon Smith with a small tweak by me.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222984 91177308-0d34-0410-b5e6-96231b3b80d8
Add a test showing what the linker IdentifiedStructTypes is for.

Without this it could just be deleted and all tests would pass.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222985 91177308-0d34-0410-b5e6-96231b3b80d8
Change how we keep track of which types are in the dest module.

Instead of keeping an explicit set, just drop the names of types we choose
to map to some other type.

This has the advantage that the name of the unused will not cause the context
to rename types on module read.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222986 91177308-0d34-0410-b5e6-96231b3b80d8
[stack protector] Set edge weights for newly created basic blocks.

This commit fixes a bug in stack protector pass where edge weights were not set
when new basic blocks were added to lists of successor basic blocks.

Differential Revision: http://reviews.llvm.org/D5766


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222987 91177308-0d34-0410-b5e6-96231b3b80d8