Fix tcmalloc arm clang build

build/config/compiler/BUILD.gn

Index: build/config/compiler/BUILD.gn
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index 08585b8539a3159819212a46802edd707fe586e7..289df8a8223ef4d23e22f8b305b50ed7fe43c3bf 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -537,6 +537,13 @@ config("compiler_cpu_abi") {
           "-march=$arm_arch",
           "-mfloat-abi=$arm_float_abi",
         ]
+        if (arm_use_thumb) {
+          cflags += [ "-mthumb" ]
+          if (is_android && !is_clang) {
+            # Clang doesn't support this option.
+            cflags += [ "-mthumb-interwork" ]
+          }
+        }
       }
       if (arm_tune != "") {
         cflags += [ "-mtune=$arm_tune" ]
@@ -761,17 +768,6 @@ config("compiler_arm_fpu") {
   }
 }
 
-config("compiler_arm_thumb") {
-  if (current_cpu == "arm" && arm_use_thumb && is_posix &&
-      !(is_mac || is_ios || is_nacl)) {
-    cflags = [ "-mthumb" ]
-    if (is_android && !is_clang) {
-      # Clang doesn't support this option.
-      cflags += [ "-mthumb-interwork" ]
-    }
-  }
-}
-
 # runtime_library -------------------------------------------------------------
 #
 # Sets the runtime library and associated options.