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

courgette/disassembler_elf_32_x86.h

Index: courgette/disassembler_elf_32_x86.h
diff --git a/courgette/disassembler_elf_32_x86.h b/courgette/disassembler_elf_32_x86.h
index 706e6fee33b101e354727ab037ee90942613d43f..bea7d78033c8430ec06bd0ba5373e2d2992aaa7a 100644
--- a/courgette/disassembler_elf_32_x86.h
+++ b/courgette/disassembler_elf_32_x86.h
@@ -20,6 +20,11 @@ class AssemblyProgram;
 
 class DisassemblerElf32X86 : public DisassemblerElf32 {
  public:
+  // Returns true if a valid executable is detected using only quick checks.
+  static bool QuickDetect(const uint8_t* start, size_t length) {
+    return DisassemblerElf32::QuickDetect(start, length, EM_386);
+  }
+
   class TypedRVAX86 : public TypedRVA {
    public:
     explicit TypedRVAX86(RVA rva) : TypedRVA(rva) { }
@@ -32,7 +37,7 @@ class DisassemblerElf32X86 : public DisassemblerElf32 {
     uint16_t op_size() const override;
   };
 
-  DisassemblerElf32X86(const void* start, size_t length);
+  DisassemblerElf32X86(const uint8_t* start, size_t length);
 
   ~DisassemblerElf32X86() override { }