fixup: swap __asm for asm

__asm is an MSVC-specific syntax for inline assembly. Clang imitates it
- but only for x86/x64 targets. Using asm instead means it works on all
architectures.

Bug: 1108769
Change-Id: I83966999ffce13c412cc3c6f99ef9086a8a4295d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315871Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Will Harris <wfh@chromium.org>
Commit-Queue: Richard Townsend <richard.townsend@arm.com>
Cr-Commit-Position: refs/heads/master@{#791543}

base/debug/invalid_access_win.cc

@@ -19,11 +19,7 @@ namespace {
 
 // Function that can be jumped midway into safely.
 __attribute__((naked)) int nop_sled() {
-  __asm {
-     nop
-     nop
-     ret
-  }
+  asm("nop; nop; ret");
 }
 
 using FuncType = decltype(&nop_sled);