[win/asan] GetInstructionSize: Fix 8D A4 24 ... to return rel_offset=3.

Author: bernhardu

compiler-rt/lib/interception/interception_win.cpp

@@ -646,6 +646,8 @@ static size_t GetInstructionSize(uptr address, size_t* rel_offset = nullptr) {
 
   switch (0x00FFFFFF & *(u32 *)address) {
     case 0x24A48D:  // 8D A4 24 XX XX XX XX : lea esp, [esp + XX XX XX XX]
+      if (rel_offset)
+        *rel_offset = 3;
       return 7;
   }
 

compiler-rt/lib/interception/tests/interception_win_test.cpp

@@ -858,6 +858,7 @@ const struct InstructionSizeData {
     { 5, {0x68, 0x71, 0x72, 0x73, 0x74}, 0, "68 XX XX XX XX : push imm32"},
     { 5, {0xb8, 0x71, 0x72, 0x73, 0x74}, 0, "b8 XX XX XX XX : mov eax, XX XX XX XX"},
     { 5, {0xB9, 0x71, 0x72, 0x73, 0x74}, 0, "b9 XX XX XX XX : mov ecx, XX XX XX XX"},
+    { 7, {0x8D, 0xA4, 0x24, 0x73, 0x74, 0x75, 0x76}, 3, "8D A4 24 XX XX XX XX : lea esp, [esp + XX XX XX XX]"},
 #if SANITIZER_WINDOWS_x64
     // sorted list
     { 2, {0x40, 0x50}, 0, "40 50 : push rax"},