Clean up some minor data structure inconsistencies

Namely, unify the include guard styling with the majority of the project, and do
flat_bitmap -> fb, to match its naming convention.

include/jemalloc/internal/eset.h

@@ -2,7 +2,7 @@
 #define JEMALLOC_INTERNAL_ESET_H
 
 #include "jemalloc/internal/atomic.h"
-#include "jemalloc/internal/flat_bitmap.h"
+#include "jemalloc/internal/fb.h"
 #include "jemalloc/internal/edata.h"
 #include "jemalloc/internal/mutex.h"
 

include/jemalloc/internal/hpdata.h

@@ -1,7 +1,7 @@
 #ifndef JEMALLOC_INTERNAL_HPDATA_H
 #define JEMALLOC_INTERNAL_HPDATA_H
 
-#include "jemalloc/internal/flat_bitmap.h"
+#include "jemalloc/internal/fb.h"
 #include "jemalloc/internal/ph.h"
 #include "jemalloc/internal/ql.h"
 #include "jemalloc/internal/typed_list.h"

include/jemalloc/internal/ph.h

@@ -1,3 +1,6 @@
+#ifndef JEMALLOC_INTERNAL_PH_H
+#define JEMALLOC_INTERNAL_PH_H
+
 /*
  * A Pairing Heap implementation.
  *
@@ -12,9 +15,6 @@
  *******************************************************************************
  */
 
-#ifndef PH_H_
-#define PH_H_
-
 /* Node structure. */
 #define phn(a_type)							\
 struct {								\
@@ -388,4 +388,4 @@ a_prefix##remove(a_ph_type *ph, a_type *phn) {				\
 	}								\
 }
 
-#endif /* PH_H_ */
+#endif /* JEMALLOC_INTERNAL_PH_H */

include/jemalloc/internal/rb.h

@@ -1,3 +1,6 @@
+#ifndef JEMALLOC_INTERNAL_RB_H
+#define JEMALLOC_INTERNAL_RB_H
+
 /*-
  *******************************************************************************
  *
@@ -19,9 +22,6 @@
  *******************************************************************************
  */
 
-#ifndef RB_H_
-#define RB_H_
-
 #ifndef __PGI
 #define RB_COMPACT
 #endif
@@ -1003,4 +1003,4 @@ a_prefix##destroy(a_rbt_type *rbtree, void (*cb)(a_type *, void *),	\
     rbtree->rbt_root = NULL;						\
 }
 
-#endif /* RB_H_ */
+#endif /* JEMALLOC_INTERNAL_RB_H */