[Courgette] Using LabelManager to reduce Courgette-apply peak RAM by 25%.

courgette/disassembler_elf_32_arm.h

Index: courgette/disassembler_elf_32_arm.h
diff --git a/courgette/disassembler_elf_32_arm.h b/courgette/disassembler_elf_32_arm.h
index 5dc6897f47c03bc89eeca252a3527bd50b70cbf6..83f5dc6a237b8dc6cdd098ca3906c750227684c5 100644
--- a/courgette/disassembler_elf_32_arm.h
+++ b/courgette/disassembler_elf_32_arm.h
@@ -36,7 +36,7 @@ class DisassemblerElf32ARM : public DisassemblerElf32 {
     // TypedRVA interfaces.
     CheckBool ComputeRelativeTarget(const uint8_t* op_pointer) override;
     CheckBool EmitInstruction(AssemblyProgram* program,
-                              RVA target_rva) override;
+                              Label* label) override;
     uint16_t op_size() const override;
 
     uint16_t c_op() const { return c_op_; }