Revert "cppgc: Inline allocation fast path across api boundary"

This reverts commit e47f9200.

Reason for revert: https://ci.chromium.org/p/v8/builders/ci/V8%20Win64%20-%20msvc/19428?

Original change's description:
> cppgc: Inline allocation fast path across api boundary
>
> Bug: chromium:1239030, chromium:1056170
> Change-Id: I4a559027e63ebbd99e51344aa659d4fb284df88f
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3190094
> Commit-Queue: Omer Katz <omerkatz@chromium.org>
> Reviewed-by: Anton Bikineev <bikineev@chromium.org>
> Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#77124}

Bug: chromium:1239030, chromium:1056170
Change-Id: I13b6f16449361a7fb9f1cac5b2e0938632df6518
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3191210
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77127}

src/heap/cppgc/allocation.cc

@@ -9,36 +9,20 @@
 #include "src/heap/cppgc/globals.h"
 #include "src/heap/cppgc/object-allocator.h"
 
-#if defined(__clang__)
-#if !defined(DEBUG) && V8_HAS_ATTRIBUTE_ALWAYS_INLINE
-#define CPPGC_FORCE_ALWAYS_INLINE __attribute__((always_inline))
-#elif !defined(DEBUG) && V8_HAS___FORCEINLINE
-#define CPPGC_FORCE_ALWAYS_INLINE __forceinline
-#else
-#define CPPGC_FORCE_ALWAYS_INLINE
-#endif
-#else
-#define CPPGC_FORCE_ALWAYS_INLINE V8_INLINE
-#endif
-
 namespace cppgc {
 namespace internal {
 
 STATIC_ASSERT(api_constants::kLargeObjectSizeThreshold ==
               kLargeObjectSizeThreshold);
 
-// Using CPPGC_FORCE_ALWAYS_INLINE to guide LTO for inlining the allocation
-// fast path.
 // static
-CPPGC_FORCE_ALWAYS_INLINE void* MakeGarbageCollectedTraitInternal::Allocate(
+void* MakeGarbageCollectedTraitInternal::Allocate(
     cppgc::AllocationHandle& handle, size_t size, GCInfoIndex index) {
   return static_cast<ObjectAllocator&>(handle).AllocateObject(size, index);
 }
 
-// Using CPPGC_FORCE_ALWAYS_INLINE to guide LTO for inlining the allocation
-// fast path.
 // static
-CPPGC_FORCE_ALWAYS_INLINE void* MakeGarbageCollectedTraitInternal::Allocate(
+void* MakeGarbageCollectedTraitInternal::Allocate(
     cppgc::AllocationHandle& handle, size_t size, GCInfoIndex index,
     CustomSpaceIndex space_index) {
   return static_cast<ObjectAllocator&>(handle).AllocateObject(size, index,