Debug: optimized usage of IO#gets using chomp argument

src/debug/dwarf/info.cr

@@ -118,7 +118,7 @@ module Debug
         when FORM::RefSig8
           @io.read_bytes(UInt64)
         when FORM::String
-          @io.gets('\0').to_s.chomp('\0')
+          @io.gets('\0', chomp: true).to_s
         when FORM::Strp
           read_ulong
         when FORM::Indirect

src/debug/dwarf/line_numbers.cr

@@ -255,15 +255,15 @@ module Debug
 
       private def read_directory_table(sequence)
         loop do
-          name = @io.gets('\0').to_s.chomp('\0')
+          name = @io.gets('\0', chomp: true).to_s
           break if name.empty?
           sequence.include_directories << name
         end
       end
 
       private def read_filename_table(sequence)
         loop do
-          name = @io.gets('\0').to_s.chomp('\0')
+          name = @io.gets('\0', chomp: true).to_s
           break if name.empty?
           dir = DWARF.read_unsigned_leb128(@io)
           time = DWARF.read_unsigned_leb128(@io)

src/debug/dwarf/strings.cr

@@ -6,7 +6,7 @@ module Debug
 
       def decode(strp)
         @io.seek(@offset + strp) do
-          @io.gets('\0').to_s.chomp('\0')
+          @io.gets('\0', chomp: true).to_s
         end
       end
     end

src/debug/elf.cr

@@ -201,7 +201,7 @@ module Debug
     def sh_name(index)
       sh = section_headers[shstrndx]
       @io.seek(sh.offset + index) do
-        @io.gets('\0').to_s.chomp('\0')
+        @io.gets('\0', chomp: true).to_s
       end
     end
 

src/debug/mach_o.cr

@@ -458,7 +458,7 @@ module Debug
 
           if nlist.strx > 0
             @io.seek(symtab.stroff + nlist.strx) do
-              nlist.name = @io.gets('\0').to_s.chomp('\0')
+              nlist.name = @io.gets('\0', chomp: true).to_s
             end
           end