[turbofan] add configuration parameters for register allocator

src/compiler/instruction.h

Index: src/compiler/instruction.h
diff --git a/src/compiler/instruction.h b/src/compiler/instruction.h
index 3a82c112e7c73542a83b384042504fc8a565ade5..1a323a490a8ee0b10e5de8036205a8003a23254e 100644
--- a/src/compiler/instruction.h
+++ b/src/compiler/instruction.h
@@ -16,8 +16,6 @@
 #include "src/compiler/opcodes.h"
 #include "src/compiler/schedule.h"
 #include "src/compiler/source-position.h"
-// TODO(titzer): don't include the macro-assembler?
-#include "src/macro-assembler.h"
 #include "src/zone-allocator.h"
 
 namespace v8 {
@@ -32,14 +30,18 @@ const InstructionCode kGapInstruction = -1;
 const InstructionCode kBlockStartInstruction = -2;
 const InstructionCode kSourcePositionInstruction = -3;
 
+// Platform independent maxes.
+static const int kMaxGeneralRegisters = 32;
+static const int kMaxDoubleRegisters = 32;
 
-#define INSTRUCTION_OPERAND_LIST(V)              \
-  V(Constant, CONSTANT, 0)                       \
-  V(Immediate, IMMEDIATE, 0)                     \
-  V(StackSlot, STACK_SLOT, 128)                  \
-  V(DoubleStackSlot, DOUBLE_STACK_SLOT, 128)     \
-  V(Register, REGISTER, Register::kNumRegisters) \
-  V(DoubleRegister, DOUBLE_REGISTER, DoubleRegister::kMaxNumRegisters)
+
+#define INSTRUCTION_OPERAND_LIST(V)           \
+  V(Constant, CONSTANT, 0)                    \
+  V(Immediate, IMMEDIATE, 0)                  \
+  V(StackSlot, STACK_SLOT, 128)               \
+  V(DoubleStackSlot, DOUBLE_STACK_SLOT, 128)  \
+  V(Register, REGISTER, kMaxGeneralRegisters) \
+  V(DoubleRegister, DOUBLE_REGISTER, kMaxDoubleRegisters)
 
 class InstructionOperand : public ZoneObject {
  public: