Bug 1525873: Temporary workaround to reload TLS state after a Cranelift call; r=sunfish

--HG--
extra : rebase_source : 2630b368ff86e057ee4d699f54ed10f1868f9de8

js/src/wasm/WasmCraneliftCompile.cpp

@@ -88,6 +88,13 @@ static bool GenerateCraneliftCode(WasmMacroAssembler& masm,
     return false;
   }
 
+  // Cranelift isn't aware of pinned registers in general, so we need to reload
+  // both TLS and pinned regs from the stack.
+  // TODO(bug 1507820): We should teach Cranelift to reload this register
+  // itself, so we don't have to do it manually.
+  masm.loadWasmTlsRegFromFrame();
+  masm.loadWasmPinnedRegsFromTls();
+
   wasm::GenerateFunctionEpilogue(masm, func.framePushed, offsets);
 
   masm.flush();