WIP]] Adding DWARF to Solana Move compiler

[jcivlin]

This is to set foot in Dwarf generating for Solana Move compiler. DIBuilder is created and will be used to accumulate more Dwarf information.

With this patch we have something as simple as:

sol@dev-equinix-new-york-2:~/tmp/090623:$ less ~/tmp/090623/0x1__unit_test.ll.debug_info

; ModuleID = '0x1__unit_test.dbg_info'
source_filename = "/home/sol/work/git/move-090523/language/move-stdlib/sources/unit_test.move"

!llvm.dbg.cu = !{!0}

!0 = distinct !DICompileUnit(language: DW_LANG_Rust, file: !1, producer: "move-mv-llvm-compiler", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, sysroot: "/")
!1 = !DIFile(filename: "unit_test.move", directory: "/home/sol/work/git/move-090523/language/move-stdlib/sources")

Since guessing the order and params to call the 'LLVM*' externs is all try and error process this still has some dbg!. This will be removed.

[jcivlin]

This is a bad merge. Closing it and opening instead #384.