Courgette: Add static method QuickDetect() to optimize program detection.

courgette/disassembler_win32_x64.h

Index: courgette/disassembler_win32_x64.h
diff --git a/courgette/disassembler_win32_x64.h b/courgette/disassembler_win32_x64.h
index 5d8b4c2943f5456bd6c5719413ed23ceaa2b6189..d81c8585f8af0ee0d23fe76878e663761b06de60 100644
--- a/courgette/disassembler_win32_x64.h
+++ b/courgette/disassembler_win32_x64.h
@@ -19,6 +19,12 @@ class AssemblyProgram;
 
 class DisassemblerWin32X64 : public DisassemblerWin32 {
  public:
+  static bool QuickDetects(const void* start, size_t length) {
+    return DisassemblerWin32::QuickDetects(
+        reinterpret_cast<const uint8_t*>(start), length,
+        kImageNtOptionalHdr64Magic);
+  }
+
   DisassemblerWin32X64(const void* start, size_t length);
   ~DisassemblerWin32X64() override = default;