[Interpreter] Replace BytecodeRegisterAllocator with a simple bump pointer.

test/cctest/interpreter/bytecode_expectations/BreakableBlocks.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 execute: yes
 wrap: yes
 
 ---
 snippet: "
@@ skipping 29 matching lines @@
   outer: {
     for (var x = 0; x < 10; ++x) {
       for (var y = 0; y < 3; ++y) {
         ++sum;
         if (x + y == 12) { break outer; }
       }
     }
   }
   return sum;
 "
-frame size: 5
+frame size: 4
 parameter count: 1
 bytecode array length: 69
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   44 S> */ B(LdaZero),
                 B(Star), R(0),
   /*   71 S> */ B(LdaZero),
                 B(Star), R(1),
   /*   76 S> */ B(LdaSmi), U8(10),
   /*   76 E> */ B(TestLessThan), R(1), U8(2),
                 B(JumpIfFalse), U8(54),
   /*   58 E> */ B(StackCheck),
   /*  106 S> */ B(LdaZero),
                 B(Star), R(2),
   /*  111 S> */ B(LdaSmi), U8(3),
   /*  111 E> */ B(TestLessThan), R(2), U8(4),
                 B(JumpIfFalse), U8(34),
   /*   93 E> */ B(StackCheck),
   /*  129 S> */ B(Ldar), R(0),
                 B(Inc), U8(6),
                 B(Star), R(0),
   /*  142 S> */ B(Ldar), R(2),
   /*  150 E> */ B(Add), R(1), U8(7),
-                B(Star), R(4),
+                B(Star), R(3),
                 B(LdaSmi), U8(12),
-  /*  152 E> */ B(TestEqual), R(4), U8(8),
+  /*  152 E> */ B(TestEqual), R(3), U8(8),
                 B(JumpIfFalse), U8(4),
   /*  161 S> */ B(Jump), U8(20),
   /*  118 S> */ B(Ldar), R(2),
                 B(Inc), U8(5),
                 B(Star), R(2),
                 B(JumpLoop), U8(-36), U8(1),
   /*   84 S> */ B(Ldar), R(1),
                 B(Inc), U8(3),
                 B(Star), R(1),
                 B(JumpLoop), U8(-56), U8(0),
@@ skipping 107 matching lines @@
 ]
 constant pool: [
   FIXED_ARRAY_TYPE,
   SHARED_FUNCTION_INFO_TYPE,
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["y"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["x"],
 ]
 handlers: [
 ]