Revert "Add bounds checking to IOBuffer seek, skip code (fixes #8193)"
Merge pull request #8237 from JuliaLang/revert-8229-kms/iobuffer_bounds_checking

Revert "Add bounds checking to IOBuffer seek, skip code (fixes #8193)"
Fix segfault when code_llvm or code_native is called on a C function.
Check for specTypes in jl_get_llvmf.
Merge pull request #8239 from danluu/code_native_segfault

Fix segfault when code_llvm or code_native are called on a C function
Fix #8242
Support LLVM_VER=3.5.0 release build
require sphinx < 1.2 to build helpdb.jl

The jlhelp.py code needs to be updated to work with sphinx 1.2,
to stop adding extra newlines.

Closes #7754.