Bug 1203287 - Fix build errors in ARM64 JIT. r=hv1989

- A new argument was added to a jumpWithPatch(), but arm64 wasn't
  updated.

- Add missing 'using namespace js'. This seems to be random fallout from
  the way source files get unified when building arm64.

- Fix a 'return = foo' typo. It seems this code was never compiled.

js/src/jit/arm64/MacroAssembler-arm64.cpp

@@ -581,7 +581,7 @@ MacroAssembler::pushFakeReturnAddress(Register scratch)
     uint32_t pseudoReturnOffset = currentOffset();
 
     leaveNoPool();
-    return = pseudoReturnOffset;
+    return pseudoReturnOffset;
 }
 
 //}}} check_macroassembler_style

js/src/jit/arm64/MacroAssembler-arm64.h

@@ -1595,7 +1595,7 @@ class MacroAssemblerCompat : public vixl::MacroAssembler
         return CodeOffsetJump(load_bo.getOffset(), pe.index());
     }
     CodeOffsetJump backedgeJump(RepatchLabel* label, Label* documentation = nullptr) {
-        return jumpWithPatch(label, documentation);
+        return jumpWithPatch(label, Always, documentation);
     }
     template <typename T>
     CodeOffsetJump branchPtrWithPatch(Condition cond, Register reg, T ptr, RepatchLabel* label) {

js/src/vm/UbiNodeCensus.cpp

@@ -6,6 +6,8 @@
 
 #include "js/UbiNodeCensus.h"
 
+using namespace js;
+
 namespace JS {
 namespace ubi {