[win/asan] GetInstructionSize: Support some more 6 byte instructions.

This patch adds several instructions seen when trying to run a
executable built with ASan with llvm-mingw.
(x86 and x86_64, using the git tip in llvm-project).

Also includes instructions collected by
Roman Pišl and Eric Pouech in the Wine bug reports below.

Related: #96270

Co-authored-by: Roman Pišl <[email protected]>
                https://bugs.winehq.org/show_bug.cgi?id=50993
                https://bugs.winehq.org/attachment.cgi?id=70233
Co-authored-by: Eric Pouech <[email protected]>
                https://bugs.winehq.org/show_bug.cgi?id=52386
                https://bugs.winehq.org/attachment.cgi?id=71626

Author: bernhardu

compiler-rt/lib/interception/interception_win.cpp

@@ -649,6 +649,9 @@ static size_t GetInstructionSize(uptr address, size_t* rel_offset = nullptr) {
     case 0xC1F6:  // F6 C1 XX : test cl, XX
       return 3;
 
+    case 0xEC81:  // 81 EC XX XX XX XX : sub esp, XX XX XX XX
+      return 6;
+
     // Cannot overwrite control-instruction. Return 0 to indicate failure.
     case 0x25FF:  // FF 25 XX YY ZZ WW : jmp dword ptr ds:[WWZZYYXX]
       return 0;
@@ -724,6 +727,7 @@ static size_t GetInstructionSize(uptr address, size_t* rel_offset = nullptr) {
     case 0x7980:  // 80 79 YY XX  cmp BYTE ptr [rcx+YY], XX
       return 4;
 
+    case 0xB841:  // 41 B8 XX XX XX XX : mov r8d, XX XX XX XX
     case 0x058A:  // 8A 05 XX XX XX XX : mov al, byte ptr [XX XX XX XX]
     case 0x058B:  // 8B 05 XX XX XX XX : mov eax, dword ptr [XX XX XX XX]
       if (rel_offset)