ARM: Fix inline assembly (r21949) for Clang.

src/arm/cpu-arm.cc

 // Copyright 2006-2009 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // CPU specific code for arm independent of OS goes here.
 #ifdef __arm__
 #ifdef __QNXNTO__
 #include <sys/mman.h>  // for cache flushing.
 #undef MAP_TYPE
 #else
@@ skipping 34 matching lines @@
 
   asm volatile(
     // This assembly works for both ARM and Thumb targets.
 
     // Preserve r7; it is callee-saved, and GCC uses it as a frame pointer for
     // Thumb targets.
     "  push {r7}\n"
                                   // r0 = beg
                                   // r1 = end
                                   // r2 = flags (0)
-    "  ldr r7, =%[scno]\n"        // r7 = syscall number
+    "  ldr r7, =%c[scno]\n"       // r7 = syscall number
     "  svc 0\n"
 
     "  pop {r7}\n"
     :
     : "r" (beg), "r" (end), "r" (flg), [scno] "i" (__ARM_NR_cacheflush)
     : "memory");
 #endif
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM