a number of low-level tweaks from code review

src/script_opt/ZAM/ZOp.h

@@ -7,10 +7,10 @@
 namespace zeek::detail {
 
 // Opcodes associated with ZAM instructions.
-typedef enum {
+enum ZOp {
 #include "zeek/ZAM-OpsDefs.h"
 	OP_NOP,
-} ZOp;
+};
 
 
 // Possible types of instruction operands in terms of which fields they use.
@@ -22,7 +22,7 @@ typedef enum {
 // I1/I2/I3/I4: the instruction's integer value, used directly (not as a slot)
 // FRAME: a slot in the (intrepreter) Frame object
 // X: no operands
-typedef enum {
+enum ZAMOpType {
 	OP_X, OP_C, OP_V, OP_V_I1, OP_VC_I1,
 
 	OP_VC,
@@ -46,15 +46,15 @@ typedef enum {
 	OP_VVVV_I3_I4,
 	OP_VVVV_I2_I3_I4,
 
-} ZAMOpType;
+};
 
 // Possible "flavors" for an operator's first slot.
-typedef enum {
+enum ZAMOp1Flavor {
 	OP1_READ,	// the slot is read, not modified
 	OP1_WRITE,	// the slot is modified, not read - the most common
 	OP1_READ_WRITE,	// the slot is both read and then modified, e.g. "++"
 	OP1_INTERNAL,	// we're doing some internal manipulation of the slot
-} ZAMOp1Flavor;
+};
 
 // Maps an operand to its flavor.
 extern ZAMOp1Flavor op1_flavor[];