recompiler: revert "avoid overallocation in code buffer" (#1241)

Turns out the overallocation was masking some bugs in sljit. Will take
this upstream and revert the ares change in the meantime.

nall/bump-allocator.hpp

@@ -88,9 +88,9 @@ struct bump_allocator {
     _offset = nextOffset(size);  //alignment
   }
 
-  auto tryAcquire(u32 size, bool reserve = true) -> u8* {
+  auto tryAcquire(u32 size) -> u8* {
     if((nextOffset(size)) > _capacity) return nullptr;
-    return reserve ? acquire(size) : acquire();
+    return acquire(size);
   }
 
 private:

nall/recompiler/generic/generic.hpp

@@ -31,7 +31,6 @@ namespace nall::recompiler {
 
     auto endFunction() -> u8* {
       u8* code = (u8*)sljit_generate_code(compiler);
-      allocator.reserve(sljit_get_generated_code_size(compiler));
       resetCompiler();
       return code;
     }

thirdparty/sljitAllocator.cpp

@@ -5,5 +5,5 @@
 
 auto sljit_nall_malloc_exec(sljit_uw size, void* exec_allocator_data) -> void* {
   auto allocator = (nall::bump_allocator*)exec_allocator_data;
-  return allocator->tryAcquire(size, false);
+  return allocator->acquire(size);
 }