[vm] Fix msvc build

Use standard constant instead of gcc/clang specific extension.

TEST=ci

Change-Id: I4b6a8e2ad62f180bebac39c90fff62cd60857d2d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/444440
Reviewed-by: Alexander Aprelev <[email protected]>
Commit-Queue: Alexander Markov <[email protected]>

Author: alexmarkov

runtime/vm/compiler/assembler/assembler_arm64.cc

@@ -296,7 +296,7 @@ void Assembler::TsanLoadAcquire(Register dst, Register addr, OperandSize size) {
   ReserveAlignedFrameSpace(0);
 
   MoveRegister(R0, addr);
-  LoadImmediate(R1, __ATOMIC_ACQUIRE);
+  LoadImmediate(R1, static_cast<int64_t>(std::memory_order_acquire));
 
   mov(CSP, SP);
   switch (size) {
@@ -337,7 +337,7 @@ void Assembler::TsanStoreRelease(Register src,
     MoveRegister(R0, addr);
     MoveRegister(R1, src);
   }
-  LoadImmediate(R2, __ATOMIC_RELEASE);
+  LoadImmediate(R2, static_cast<int64_t>(std::memory_order_release));
 
   switch (size) {
     case kEightBytes:

runtime/vm/compiler/assembler/assembler_riscv.cc

@@ -3105,7 +3105,7 @@ void Assembler::TsanLoadAcquire(Register dst,
   ReserveAlignedFrameSpace(0);
 
   AddImmediate(A0, addr.base(), addr.offset());
-  LoadImmediate(A1, __ATOMIC_ACQUIRE);
+  LoadImmediate(A1, static_cast<intx_t>(std::memory_order_acquire));
 
   switch (size) {
     case kEightBytes:
@@ -3156,7 +3156,7 @@ void Assembler::TsanStoreRelease(Register src,
     AddImmediate(A0, addr.base(), addr.offset());
     MoveRegister(A1, src);
   }
-  LoadImmediate(A2, __ATOMIC_RELEASE);
+  LoadImmediate(A2, static_cast<intx_t>(std::memory_order_release));
 
   switch (size) {
     case kEightBytes:

runtime/vm/compiler/assembler/assembler_x64.cc

@@ -2135,7 +2135,8 @@ void Assembler::TsanLoadAcquire(Register dst, Address addr, OperandSize size) {
   ReserveAlignedFrameSpace(0);
 
   leaq(CallingConventions::kArg1Reg, addr);
-  LoadImmediate(CallingConventions::kArg2Reg, __ATOMIC_ACQUIRE);
+  LoadImmediate(CallingConventions::kArg2Reg,
+                static_cast<int64_t>(std::memory_order_acquire));
 
   switch (size) {
     case kEightBytes:
@@ -2182,7 +2183,8 @@ void Assembler::TsanStoreRelease(Register src, Address addr, OperandSize size) {
     leaq(CallingConventions::kArg1Reg, addr);
     MoveRegister(CallingConventions::kArg2Reg, src);
   }
-  LoadImmediate(CallingConventions::kArg3Reg, __ATOMIC_RELEASE);
+  LoadImmediate(CallingConventions::kArg3Reg,
+                static_cast<int64_t>(std::memory_order_release));
 
   switch (size) {
     case kEightBytes: