UDIS86: fix `UDIS86Instruction >> branchTarget` to handle indirect branch using memory argument ...such as: jmp 0x0($rdx) In that case, branch target address is not statically known so `nil` is returned. Callers must handle this.

UDIS86: fixed crash caused by keeping `ud_t` structure on smalltalk heap ...and this the structure may move. Thisx resulted on hard-to-debug heap corruptions because `ud_t.asm_buf` is initializad to a pointer to `ud_t.asm_buf_int`. Therefore when the bytearray moved, the pointer become invalid and subsequent call to `ud_disassemble()` smashed whatever object happened to be where the bytearray were. The fix is straigtforward, use `ExternalBytes`! Sigh.

Minor tweaks to shorten method names.

UDIS86: Added support for inspecting operands

libudis86sx: Fixed build support files

C1: Initial support for basic debug info

C1: Emit interrupt check on backward branch ...so inlined loops are interruptable.

C1: Added support for branching In order to implement braning, a method is first pre-scanned for basic blocks by `C1BasicBlockAnalyzer*`. It returns an entry block (as `C1BasicBlock` instance) which is eventually linked to other blocks by its `successors` blocks. The compilation process then maps 1-to-1 each "C1" basic block to an LLVM basic block. When compiling, it starts with entry block and then recursivelly proceeds with successors.

Changed CompiledCode >> #codeObject to return nil if no code object is associated with the receicer. Also do not require a CompiledCode to be marked with F_DYNAMIC as users may forget. The VM API `stxCompiledCodeObjectForCompiledCode()` is robust enough to handle it.

Added support for integer arithmetics