Fix random bugs discovered while reading the code

In HsaTimer::correlated_pair_ns, the time ID should be used to
select the clock ID passed to clock_gettime.

In MemoryPool::allocator_default, pass the correct value to realloc.

Change-Id: I5d10c0994c07fdeadd99c81deba4e71a4f579523

src/core/memory_pool.h

@@ -52,7 +52,7 @@ class MemoryPool {
     if (*ptr == NULL) {
       *ptr = reinterpret_cast<char*>(malloc(size));
     } else if (size != 0) {
-      *ptr = reinterpret_cast<char*>(realloc(ptr, size));
+      *ptr = reinterpret_cast<char*>(realloc(*ptr, size));
     } else {
       free(*ptr); 
       *ptr = NULL;

src/util/hsa_rsrc_factory.h

@@ -223,7 +223,7 @@ class HsaTimer {
   void correlated_pair_ns(time_id_t time_id, uint32_t iters,
                           timestamp_t* timestamp_v, timestamp_t* time_v, timestamp_t* error_v) const {
     clockid_t clock_id = 0;
-    switch (clock_id) {
+    switch (time_id) {
       case TIME_ID_CLOCK_REALTIME:
         clock_id = CLOCK_REALTIME;
         break;