Rename TARGET_OS_* to HOST_OS_*.

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 62 matching lines @@
   } while (0)
 
 
 // A type large enough to contain the value of the C++ vtable. This is needed
 // to support the handle operations.
 typedef uword cpp_vtable;
 
 
 // When using GCC we can use GCC attributes to ensure that certain
 // contants are 8 or 16 byte aligned.
-#if defined(TARGET_OS_WINDOWS)
+#if defined(HOST_OS_WINDOWS)
 #define ALIGN8 __declspec(align(8))
 #define ALIGN16 __declspec(align(16))
 #else
 #define ALIGN8 __attribute__((aligned(8)))
 #define ALIGN16 __attribute__((aligned(16)))
 #endif
 
 
 // Zap value used to indicate uninitialized handle area (debug purposes).
 #if defined(ARCH_IS_32_BIT)
 static const uword kZapUninitializedWord = 0xabababab;
 #else
 static const uword kZapUninitializedWord = 0xabababababababab;
 #endif
 
 
 // Macros to get the contents of the fp register.
-#if defined(TARGET_OS_WINDOWS)
+#if defined(HOST_OS_WINDOWS)
 
 // clang-format off
 #if defined(HOST_ARCH_IA32)
 #define COPY_FP_REGISTER(fp)                                                   \
   __asm { mov fp, ebp}                                                         \
   ;  // NOLINT
 // clang-format on
 #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(TARGET_OS_WINDOWS))
+#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(TARGET_OS_MAC)
+#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
 
-#endif  // !defined(TARGET_OS_WINDOWS))
+#endif  // !defined(HOST_OS_WINDOWS))
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_GLOBALS_H_