kernel/vm_manager: Remove unnecessary heap_used data member

This isn't required anymore, as all the kernel ever queries is the size
of the current heap, not the total usage of it.

src/core/hle/kernel/svc.cpp

@@ -806,7 +806,7 @@ static ResultCode GetInfo(u64* result, u64 info_id, u64 handle, u64 info_sub_id)
             return RESULT_SUCCESS;
 
         case GetInfoType::TotalHeapUsage:
-            *result = process->VMManager().GetTotalHeapUsage();
+            *result = process->VMManager().GetCurrentHeapSize();
             return RESULT_SUCCESS;
 
         case GetInfoType::IsVirtualAddressMemoryEnabled:

src/core/hle/kernel/vm_manager.cpp

@@ -285,7 +285,6 @@ ResultVal<VAddr> VMManager::HeapAllocate(u64 size) {
         return mapping_result.Code();
     }
 
-    heap_used = size;
     return MakeResult<VAddr>(heap_region_base);
 }
 
@@ -303,7 +302,6 @@ ResultCode VMManager::HeapFree(VAddr target, u64 size) {
         return result;
     }
 
-    heap_used -= size;
     return RESULT_SUCCESS;
 }
 
@@ -596,6 +594,7 @@ void VMManager::InitializeMemoryRegionRanges(FileSys::ProgramAddressSpaceType ty
 
     heap_region_base = map_region_end;
     heap_region_end = heap_region_base + heap_region_size;
+    heap_end = heap_region_base;
 
     new_map_region_base = heap_region_end;
     new_map_region_end = new_map_region_base + new_map_region_size;
@@ -690,10 +689,6 @@ u64 VMManager::GetTotalMemoryUsage() const {
     return 0xF8000000;
 }
 
-u64 VMManager::GetTotalHeapUsage() const {
-    return heap_used;
-}
-
 VAddr VMManager::GetAddressSpaceBaseAddress() const {
     return address_space_base;
 }

src/core/hle/kernel/vm_manager.h

@@ -418,9 +418,6 @@ public:
     /// Gets the total memory usage, used by svcGetInfo
     u64 GetTotalMemoryUsage() const;
 
-    /// Gets the total heap usage, used by svcGetInfo
-    u64 GetTotalHeapUsage() const;
-
     /// Gets the address space base address
     VAddr GetAddressSpaceBaseAddress() const;
 
@@ -639,8 +636,5 @@ private:
     // The end of the currently allocated heap. This is not an inclusive
     // end of the range. This is essentially 'base_address + current_size'.
     VAddr heap_end = 0;
-
-    // Indicates how many bytes from the current heap are currently used.
-    u64 heap_used = 0;
 };
 } // namespace Kernel