[Interpreter] Flush register equivalance on resume.

BUG=v8:6379

Change-Id: Ieddf861db3e5ef0445989c25ba5ee36f47c0d1bf
Reviewed-on: https://chromium-review.googlesource.com/506155
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45343}

src/interpreter/bytecode-register-optimizer.h

@@ -66,7 +66,8 @@ class V8_EXPORT_PRIVATE BytecodeRegisterOptimizer final
   INLINE(void PrepareForBytecode()) {
     if (Bytecodes::IsJump(bytecode) || Bytecodes::IsSwitch(bytecode) ||
         bytecode == Bytecode::kDebugger ||
-        bytecode == Bytecode::kSuspendGenerator) {
+        bytecode == Bytecode::kSuspendGenerator ||
+        bytecode == Bytecode::kResumeGenerator) {
       // All state must be flushed before emitting
       // - a jump bytecode (as the register equivalents at the jump target
       //   aren't known)
@@ -74,6 +75,7 @@ class V8_EXPORT_PRIVATE BytecodeRegisterOptimizer final
       //   aren't known)
       // - a call to the debugger (as it can manipulate locals and parameters),
       // - a generator suspend (as this involves saving all registers).
+      // - a generator resume (as this involves restoring all registers).
       Flush();
     }