Revert "Add support for __declspec(nocf)."

This reverts commit 0c58583b.

Reason for revert: https://crbug.com/v8/10656 and failures in https://ci.chromium.org/p/v8/builders/ci/V8%20Win64%20-%20msvc/14135

Original change's description:
> Add support for __declspec(nocf).
> 
> __declspec(nocf) syntax was added in https://reviews.llvm.org/D72167
> and annotates that checks should not be added on indirect calls
> within that function.
> 
> BUG=chromium:584575
> 
> Change-Id: Ib2e2d2a827186a9c1fd3de15356b2b04d6a69e49
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2270707
> Reviewed-by: Clemens Backes <clemensb@chromium.org>
> Commit-Queue: Will Harris <wfh@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#68590}

TBR=wfh@chromium.org,clemensb@chromium.org

Change-Id: Icec64feb44715a65e905a93e0c47fb37d4f11a09
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:584575
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2274736Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68598}

src/base/macros.h

@@ -176,14 +176,7 @@ V8_INLINE Dest bit_cast(Source const& source) {
 
 // DISABLE_CFI_ICALL -- Disable Control Flow Integrity indirect call checks,
 // useful because calls into JITed code can not be CFI verified.
-#ifdef V8_OS_WIN
-// On Windows, also needs __declspec(guard(nocf)) for CFG.
-#define DISABLE_CFI_ICALL           \
-  V8_CLANG_NO_SANITIZE("cfi-icall") \
-  __declspec(guard(nocf))
-#else
 #define DISABLE_CFI_ICALL V8_CLANG_NO_SANITIZE("cfi-icall")
-#endif
 
 #if V8_CC_GNU
 #define V8_IMMEDIATE_CRASH() __builtin_trap()