thumb: add disassembler

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

src/cpu/arm/disassembler.cc

@@ -1,8 +1,7 @@
 #include "instruction.hh"
 #include "util/bits.hh"
 
-namespace matar {
-namespace arm {
+namespace matar::arm {
 std::string
 Instruction::disassemble() {
     auto condition = stringify(this->condition);
@@ -232,4 +231,3 @@ Instruction::disassemble() {
       data);
 }
 }
-}

src/cpu/arm/instruction.cc

@@ -2,8 +2,7 @@
 #include "util/bits.hh"
 #include <iterator>
 
-namespace matar {
-namespace arm {
+namespace matar::arm {
 Instruction::Instruction(uint32_t insn)
   : condition(static_cast<Condition>(bit_range(insn, 28, 31))) {
     // Branch and exhcange
@@ -275,4 +274,3 @@ Instruction::Instruction(uint32_t insn)
     }
 }
 }
-}

src/cpu/arm/instruction.hh

@@ -5,8 +5,7 @@
 #include <fmt/ostream.h>
 #include <variant>
 
-namespace matar {
-namespace arm {
+namespace matar::arm {
 
 // https://en.cppreference.com/w/cpp/utility/variant/visit
 template<class... Ts>
@@ -223,4 +222,3 @@ struct Instruction {
 #endif
 };
 }
-}