Fix debug info for main chunk of stripped bytecode.
Merge branch 'master' into v2.1
x86: lj_math_random_step() clobbers XMM regs on OSX Clang.
Merge branch 'master' into v2.1
FFI: Fix frame traversal for backtraces with FFI callbacks.
Merge branch 'master' into v2.1
Typo.
Merge branch 'master' into v2.1
Merge branch 'v2.1' into v2.1-agentzh