Convert runtime atomics functions to inline asm

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index b002c676c3085019204e8c1d601e64b925020b40..1f98d15eeba2cdf4233868e9c41a3db621263aef 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1195,6 +1195,7 @@ source_set("v8_base") {
     "src/runtime-profiler.h",
     "src/runtime/runtime-array.cc",
     "src/runtime/runtime-atomics.cc",
+    "src/runtime/runtime-atomics-intrinsics-inl.h",
     "src/runtime/runtime-classes.cc",
     "src/runtime/runtime-collections.cc",
     "src/runtime/runtime-compiler.cc",
@@ -1333,6 +1334,8 @@ source_set("v8_base") {
       "src/ic/ia32/stub-cache-ia32.cc",
       "src/regexp/ia32/regexp-macro-assembler-ia32.cc",
       "src/regexp/ia32/regexp-macro-assembler-ia32.h",
+      "src/runtime/runtime-atomics-ia32-inl.h",
+      "src/runtime/runtime-atomics-x64-inl.h",
     ]
   } else if (v8_target_arch == "x64") {
     sources += [
@@ -1355,6 +1358,7 @@ source_set("v8_base") {
       "src/ic/x64/stub-cache-x64.cc",
       "src/regexp/x64/regexp-macro-assembler-x64.cc",
       "src/regexp/x64/regexp-macro-assembler-x64.h",
+      "src/runtime/runtime-atomics-x64-inl.h",
       "src/x64/assembler-x64-inl.h",
       "src/x64/assembler-x64.cc",
       "src/x64/assembler-x64.h",
@@ -1372,6 +1376,12 @@ source_set("v8_base") {
       "src/x64/macro-assembler-x64.cc",
       "src/x64/macro-assembler-x64.h",
     ]
+    if (is_win) {
+      sources += [
+        "src/runtime/runtime-atomics-x64.asm",
+        "src/runtime/runtime-atomics-x64.h",
+      ]
+    }
   } else if (v8_target_arch == "arm") {
     sources += [
       "src/arm/assembler-arm-inl.h",