track global inits

llvm-svn: 36385

Read global symtab

llvm-svn: 36378

implement reading of abbrevs, and writing of abbreviated global varrs.

llvm-svn: 36367

first part of implementation of abbrevs. The writer isn't fully there yet and the
reader doesn't handle them at all yet.

llvm-svn: 36363

Initial support for reading bitcode files. They currently only read types,
the type symtab, and global/function protos, and are missing the important
size optimization, but it is a place to start.

Initial support for reading bitcode files. They currently only read types,
the type symtab, and global/function protos, and are missing the important
size optimization, but it is a place to start.

llvm-svn: 36330

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