style: eliminate equality tests with true and false

Using '== true' in a boolean expression is totally redundant,
and using '== false' is pretty verbose (and arguably less
readable in most cases) compared to '!'.

It's somewhat of a pet peeve, perhaps, but I had some time
waiting for some tests to run and decided to clean these up.

Unfortunately, SLICC appears not to have the '!' operator,
so I had to leave the '== false' tests in the SLICC code.

src/arch/mips/tlb.cc

@@ -184,7 +184,7 @@ TLB::insertAt(PTE &pte, unsigned Index, int _smallPages)
                  (pte.D0 << 2) | (pte.V0 <<1) | pte.G),
                 ((pte.PFN1 <<6) | (pte.C1 << 3) |
                  (pte.D1 << 2) | (pte.V1 <<1) | pte.G));
-        if (table[Index].V0 == true || table[Index].V1 == true) {
+        if (table[Index].V0 || table[Index].V1) {
             // Previous entry is valid
             PageTable::iterator i = lookupTable.find(table[Index].VPN);
             lookupTable.erase(i);

src/arch/power/tlb.cc

@@ -165,7 +165,7 @@ TLB::insertAt(PowerISA::PTE &pte, unsigned Index, int _smallPages)
     } else {
 
         // Update TLB
-        if (table[Index].V0 == true || table[Index].V1 == true) {
+        if (table[Index].V0 || table[Index].V1) {
 
             // Previous entry is valid
             PageTable::iterator i = lookupTable.find(table[Index].VPN);

src/arch/sparc/tlb.cc

@@ -290,7 +290,7 @@ TLB::demapContext(int partition_id, int context_id)
     for (int x = 0; x < size; x++) {
         if (tlb[x].range.contextId == context_id &&
             tlb[x].range.partitionId == partition_id) {
-            if (tlb[x].valid == true) {
+            if (tlb[x].valid) {
                 freeList.push_front(&tlb[x]);
             }
             tlb[x].valid = false;
@@ -329,7 +329,7 @@ TLB::flushAll()
     lookupTable.clear();
 
     for (int x = 0; x < size; x++) {
-        if (tlb[x].valid == true)
+        if (tlb[x].valid)
             freeList.push_back(&tlb[x]);
         tlb[x].valid = false;
         tlb[x].used = false;

src/arch/x86/pagetable_walker.cc

@@ -233,7 +233,7 @@ Fault
 Walker::WalkerState::startWalk()
 {
     Fault fault = NoFault;
-    assert(started == false);
+    assert(!started);
     started = true;
     setupWalk(req->getVaddr());
     if (timing) {
@@ -262,7 +262,7 @@ Fault
 Walker::WalkerState::startFunctional(Addr &addr, unsigned &logBytes)
 {
     Fault fault = NoFault;
-    assert(started == false);
+    assert(!started);
     started = true;
     setupWalk(addr);