[win/asan] GetInstructionSize: Remove duplicate instruction `FF 25 ..…

….`. (llvm#116894)

It appears already some lines above with this comment:
  "Cannot overwrite control-instruction. Return 0 to indicate failure.".

Replacing just the comment in the first appearance.

Found after creating the test in llvm#113085.

compiler-rt/lib/interception/interception_win.cpp

@@ -635,7 +635,7 @@ static size_t GetInstructionSize(uptr address, size_t* rel_offset = nullptr) {
       return 2;
 
     // Cannot overwrite control-instruction. Return 0 to indicate failure.
-    case 0x25FF:  // FF 25 XX XX XX XX : jmp [XXXXXXXX]
+    case 0x25FF:  // FF 25 XX YY ZZ WW : jmp dword ptr ds:[WWZZYYXX]
       return 0;
   }
 
@@ -872,7 +872,6 @@ static size_t GetInstructionSize(uptr address, size_t* rel_offset = nullptr) {
     case 0x75FF:  // FF 75 XX : push dword ptr [ebp + XX]
       return 3;
     case 0xC1F7:  // F7 C1 XX YY ZZ WW : test ecx, WWZZYYXX
-    case 0x25FF:  // FF 25 XX YY ZZ WW : jmp dword ptr ds:[WWZZYYXX]
       return 6;
     case 0x3D83:  // 83 3D XX YY ZZ WW TT : cmp TT, WWZZYYXX
       return 7;