Consistently use __asm__ rather than asm.

For grepability.

Change-Id: Iae46e1684695eb42cfc1267b744d0442acbbfe25
diff --git a/src/oat/runtime/x86/context_x86.cc b/src/oat/runtime/x86/context_x86.cc
index d6f45da..412b655 100644
--- a/src/oat/runtime/x86/context_x86.cc
+++ b/src/oat/runtime/x86/context_x86.cc
@@ -63,7 +63,7 @@
   // correct delivery instruction.
   gprs_[ESP] -= 4;
   *(reinterpret_cast<uintptr_t*>(gprs_[ESP])) = eip_;
-  asm volatile(
+  __asm__ __volatile__(
       "pushl %4\n\t"
       "pushl %0\n\t"
       "pushl %1\n\t"