Use __builtin_frame_address instead of inline assembly on non-Windows platforms.

runtime/vm/globals.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef RUNTIME_VM_GLOBALS_H_
 #define RUNTIME_VM_GLOBALS_H_
 
 // This file contains global definitions for the VM library only. Anything that
 // is more globally useful should be added to 'vm/globals.h'.
 
@@ skipping 98 matching lines @@
 #elif defined(HOST_ARCH_X64)
 // We don't have the asm equivalent to get at the frame pointer on
 // windows x64, return the stack pointer instead.
 #define COPY_FP_REGISTER(fp) fp = Thread::GetCurrentStackPointer();
 #else
 #error Unknown host architecture.
 #endif
 
 #else  // !defined(HOST_OS_WINDOWS))
 
-// Assume GCC-like inline syntax is valid.
-#if defined(HOST_ARCH_IA32)
-#define COPY_FP_REGISTER(fp) asm volatile("movl %%ebp, %0" : "=r"(fp));
-#elif defined(HOST_ARCH_X64)
-#define COPY_FP_REGISTER(fp) asm volatile("movq %%rbp, %0" : "=r"(fp));
-#elif defined(HOST_ARCH_ARM)
-#if defined(HOST_OS_MAC)
-#define COPY_FP_REGISTER(fp) asm volatile("mov %0, r7" : "=r"(fp));
-#else
-#define COPY_FP_REGISTER(fp) asm volatile("mov %0, r11" : "=r"(fp));
-#endif
-#elif defined(HOST_ARCH_ARM64)
-#define COPY_FP_REGISTER(fp) asm volatile("mov %0, x29" : "=r"(fp));
-#elif defined(HOST_ARCH_MIPS)
-#define COPY_FP_REGISTER(fp) asm volatile("move %0, $fp" : "=r"(fp));
-#else
-#error Unknown host architecture.
-#endif
+// Assume GCC-compatible builtins.
+#define COPY_FP_REGISTER(fp)                                                   \
+  fp = reinterpret_cast<uintptr_t>(__builtin_frame_address(0));
 
 #endif  // !defined(HOST_OS_WINDOWS))
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_GLOBALS_H_