added TargetRegistry_targets_list

this allows all targets to be enumerated. this is generally useful,
but i specifically wanted to be able to see which targets report
having a disassembler. it is necessary to init the various
target components in order for them to report that they have one,
thus i added InitializeAllDisassemblers and InitializeAllAsmParsers
to TargetSelect.py

test/target_info.py

@@ -0,0 +1,30 @@
+from llvmpy.api import llvm; 
+llvm.InitializeAllTargets()
+llvm.InitializeAllTargetInfos()
+llvm.InitializeAllTargetMCs()
+llvm.InitializeAllAsmPrinters()
+llvm.InitializeAllDisassemblers()
+llvm.InitializeAllAsmParsers()
+
+mthds = (
+    ("description:",            "getShortDescription"),
+    ("has JIT:",                "hasJIT"             ),
+    ("has target machine:",     "hasTargetMachine"   ),
+    ("has asm backend:",        "hasMCAsmBackend"    ),
+    ("has asm parser:",         "hasMCAsmParser"     ),
+    ("has asm printer:",        "hasAsmPrinter"      ),
+    ("has disassembler:",       "hasMCDisassembler"  ),
+    ("has inst printer:",       "hasMCInstPrinter"   ),
+    ("has code emitter:",       "hasMCCodeEmitter"   ),
+    ("has object streamer:",    "hasMCObjectStreamer"),
+    ("has asm streamer:",       "hasAsmStreamer"     )
+)
+
+for target in llvm.TargetRegistry.targetsList():
+    print("target %s" % target.getName())
+    fmt = "%3s%-25s%r"
+    for (desc, mthd) in mthds:
+        print(fmt % ("", desc, getattr(target, mthd)()))
+
+    print("")
+